Monoxide CO Research Articles

The Environmental Safety of the Fiat 0.9 TwinAir Compressed Natural Gas Engine

The article presents the results of measurements of concentrations of selected exhaust components of the Fiat 0.9 TwinAir spark-ignition engine operating according to load characteristics. The tested engine has an indirect, multi-point petrol supply system and has been retrofitted with an indirect CNG injection system. The results of the tests are a comparison of selected economic, ecological and energetic indicators of engine operation obtained when fuelled with CNG and 95 octane petrol. The operation of the engine fuelled with gaseous fuel was preceded by autocalibration of the controller of the fuelling system. The article presents the results of tests of concentrations of harmful components of exhaust gases: carbon dioxide CO2, carbon monoxide CO, nitrogen oxides NOx and HC hydrocarbons. Moreover, the values of lambda λ air excess coefficient are presented and fuel consumption is compared. The obtained results of the tests of the engine fuelled with CNG gas show a significant decrease in the value of the obtained torque in comparison to the engine torque when fuelled with petrol. The engine fuelled with compressed natural gas contributed to the improvement of its ecological properties and a reduction of fuel consumption, which are important factors of ecological and energy safety. Exhaust gas analysis showed a reduction in the concentration of harmful components of exhaust gases, mainly hydrocarbons and nitrogen oxides. A positive effect of the operation of the engine powered by CNG was also a significant reduction of carbon dioxide in the exhaust gases compared to the engine powered with gasoline.

Experimental study of high temperature oxidation of dimethyl ether, n-butanol and methane

An experimental study of the kinetics of oxidation of dimethyl ether, n-butanol, and methane was carried out using emission and atomic resonance absorption spectroscopy. All experiments were performed in a shock tube behind reflected shock wave in a wide temperature range from 1890 to 3250 K at a pressure of 2.4 ± 0.4 bar. In all investigated conditions, the peaks of nonequilibrium UV radiation of electronically excited carbon monoxide CO(a3Πr) were observed. Besides, the resonant absorption profiles of atomic oxygen in the ground electronic state O(3P) converted to O-atom concentration profiles were for the first time measured at this temperature range. For simulating the CO(a3Πr) radiation experimental profiles a kinetic mechanism of its formation and consumption was developed. This mechanism was implemented into existing comprehensive detailed kinetic models (such as Ranzi et al. (2014), Vasu and Sarathy (2013), NUIG Mech 56.54 (2013), GRI-Mech 3.0 (1999) and Alviso et al. (2018)), which were then tested on the obtained experimental profiles of atomic oxygen and electronically excited carbon monoxide. It was shown that the proposed CO(a3Πr) sub-mechanism nearly correct describes the ongoing reaction processes, however, complete compliance was not achieved. To elucidate reactions responsible for the differences observed, a sensitivity analysis was performed. As a result, the most important elementary reactions were determined.

Effects of stunning methods on pre rigor changes in rainbow trout (Oncorhynchus mykiss) reared at two different temperatures

The effects of two stunning methods (carbon monoxide asphyxia, CO, and electroshock, E) on blood plasma parameters, rigor index, fillet pH and shape changes, ATP breakdown and Adenylate Energy Charge (AEC) in muscle immediately post mortem were investigated in rainbow trout (Oncorhynchus mykiss) kept in tanks containing water set at 8 °C or 12 °C. Both the methods here adopted induced a stress-response which, however, was not able to affect the rigor mortis development and fillet pH. The fillets from the E group showed the strongest length contraction and width increase at 48 h post mortem. The CO stunning method exhibited the highest levels of both ATP and AEC in the muscle immediately after death, equal to 2.28 µmol/g and 0.83, respectively, while 1.12 µmol/g and 0.64 values were found in the E group. In addition, we found that the water temperature might interact with the stunning method and minimise the stress response. In the present trial, the most suitable use of the CO stunning method would be coupled with 12 °C of rearing water temperature to better preserve ATP and AEC in muscles. Highlights CO stunning preserves ATP and AEC in trout muscle better than electrical stunning Water temperature might interact with the stunning and minimise the stress response CO stunning is suggested to be coupled with 12 °C of water temperature Electricity should be avoided at 8 °C of water temperature

Efficient and Effective Gas Sensor Calibration with Randomized Gas Mixtures

Efficient and Effective Gas Sensor Calibration with Randomized Gas Mixtures

(Sub)mm-Wavelength Observations of Pre-Planetary Nebulae and Young Planetary Nebulae

This is a non-comprehensive review of observations of pre-Planetary Nebulae (pPNe) and young Planetary Nebulae (yPNe) at (sub)mm-wavelengths, a valuable window for probing multi-phased gas and dust in these objects. This contribution focuses on observations of molecular lines (from carbon monoxide—CO—and other species), and briefly at the end, on hydrogen radio recombination lines from the emerging H ii regions at the center of yPNe. The main goal of this contribution is to show the potential of (sub)mm-wavelength observations of pPNe/yPNe to help the community to devise and develop new observational projects that will bring us closer to a better understanding of these latest stages of the evolution of low-to-intermediate (∼0.8–8 M ⊙ ) mass stars.

Review of technologies for suppressing emissions of benzo(a)pyrene at energy enterprises

Power engineering enterprises have a great impact on the environment. Flue gas emissions contain solid ash particles, sulfur oxides SO2, SO3, nitrogen oxides NOx, carbon monoxide CO (monoxide) CH hydrocarbons; in some cases, there may be a danger of radiation contamination, but the most dangerous substance emitted into the atmosphere is benzo(a)pyrene C20H12, which has a negative effect on human health. Polycyclic aromatic hydrocarbons (PAH), including benzo(a)pyrene contained in flue gas emissions from energy enterprises, have a serious impact on human health. Taking measures to suppress other harmful emissions from thermal power plants (nitrogen oxides and sulfur oxides) can increase the content of benzo(a)pyrene, which poses a serious problem for modern researchers. As part of this study, various technologies for suppressing benzo(a)pyrene emissions at energy enterprises were considered. The main disadvantages of the described methods are highlighted. The possible danger of increasing benzo(a)pyrene emissions when trying to suppress other emissions is noted.

Study of the Kinetics of Metastable Molecular Nitrogen in the Atmospheres of the Earth, Triton, Titan, and Pluto

In the interaction of high-energy electrons with gases of planetary atmospheres where the primary component is molecular nitrogen, a significant fraction of particle energy is spent on the excitation of electronically excited triplet states of N2. The processes of energy transfer from metastable molecular nitrogen $${{{\text{N}}}_{{\text{2}}}}\left( {{{{\text{A}}}^{{\text{3}}}}\Sigma _{{\text{u}}}^{ + }} \right)$$ to other components in the atmosphere of the Earth (a mixture of N2–O2–O gases), as well as in the atmospheres of Titan, Triton, and Pluto (a mixture of N2–CH4–CO gases), are considered. The paper discusses the processes in which metastable molecular nitrogen $${{{\text{N}}}_{{\text{2}}}}\left( {{{{\text{A}}}^{{\text{3}}}}\Sigma _{{\text{u}}}^{ + }} \right)$$ affects the kinetics of electronically excited atomic and molecular oxygen in the auroral ionosphere of the Earth. In addition, it is shown numerically for the first time that the contribution of $${{{\text{N}}}_{{\text{2}}}}\left( {{{{\text{A}}}^{{\text{3}}}}\Sigma _{{\text{u}}}^{ + }} \right)$$ to the formation of electronically excited carbon monoxide CO(a3Π) increases significantly with increasing density in the atmospheres of Titan, Triton, and Pluto, and becomes predominant for the lower vibrational levels of CO(a3Π).

ENVIRONMENTAL QUALITY ON SURROUNDING COMMUNITY OF COAL MINING AREA IN SAMARINDA, EAST KALIMANTAN, INDONESIA

Background: The massive exploration of coal in Samarinda could lead to various environmental consequences, such as metal contamination of soil, toxic materials and sediments in rivers and air pollution. Scanning and exploring the impact of mining on environmental quality will strategic to develop and carry out rehabilitation on damaged ecosystems and as a preventive and adaptive action of the community in responding the threat of global environmental change.Objective: This paper mainly focused on determining environmental quality based on water and air quality parameters (sulfur dioxide/SO2, Nitrogen dioxide/NO2, Carbon monoxide CO and TSP/dust) also determining community perception about the environment.Methods: Water sample taken from Betapus river (upstream and downstream) and well. Air sample taken around residential in coal mining area. Household survey of 305 respondents conducted in five community neighborhoods in area that affected by mining activities. In general, the air quality parameters such as SO2, NO2, CO and TSP at normal condition.Result: The measurement result of wells water revealed that only the pH (power of hydrogen) at normal condition, while BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), Iron (Fe) exceed the threshold and almost all water sample exceeds the threshold in Manganese (Mn). The results of river quality in pH and COD showed that both in the upstream, midstream and downstream on normal condition, while Fe, COD exceeds the threshold. The BOD in the upper, middle parts of the river exceed the threshold.Conclusion: This study found that there had been anomaly in water environment compounds. These indicate that mining has led to the occurrence of water pollution. Therefore, needs reevaluation analysis of environmental impacts document of the mining companies in Bayur Village. It is also important to treating Mn and Fe of well or river water, especially if the water use for drinking.

IOT based Air Quality Monitoring System Using MQ135 and MQ7 with Machine Learning Analysis

This paper deals with measuring the Air Quality using MQ135 sensor along with Carbon Monoxide CO using MQ7 sensor. Measuring Air Quality is an important element for bringing awareness to take care of the future generations and for a healthier life. Based on this, Government of India has already taken certain measures to ban Single Stroke and Two Stroke Engine based motorcycles which are emitting high pollution. We are trying to implement a system using IoT platforms like Thingspeak or Cayenne in order to bring awareness to every individual about the harm we are doing to our environment. Already, New Delhi is remarked as the most pollution city in the world recording Air Quality above 300 PPM. We have used easiest platform like Thingspeak and set the dashboard to public such that everyone can come to know the Air Quality at the location where the system is installed. Machine Learning analysis brings us a lot of depth in understanding the information that we obtained from the data. Moreover, we are proviing a reducement of the cost of components versus the state of the art.

The Impact of Powering an Engine with Fuels from Renewable Energy Sources including its Software Modification on a Drive Unit Performance Parameters

The application of fuels from renewable energy sources for combustion engine powering involves a great demand for this kind of energy while its production infrastructure remains underdeveloped. The use of this kind of fuel is supposed to reduce the emission of greenhouse gases and the depletion of natural resources and to increase the share of renewable energy sources in total energy consumption and thus support sustainable development in Europe. This study presents the results of research on selected performance parameters of transport by internal combustion engines including: power, torque, the emission of sound generated by the engine, the content of exhaust components (oxygen O2, carbon monoxide CO, carbon dioxide CO2, nitrogen dioxide NO2), and the content of particulate matter (PM) in exhaust emission. Three self-ignition engines were tested. The fuel injection controllers of the tested internal combustion engines were additionally adjusted by increasing the fuel dose and the load of air. The material used in the tests were mixtures of diesel oil and fatty acid methyl esters of different concentration. A statistical analysis was performed based of the results. The purpose of the work was to develop a resulting model for assessing the operation of engines fueled with biofuel and diesel mixtures while changing the vehicle’s computer software. A computer simulation algorithm was also developed for the needs of the tests which was used to prognose the state of the test results for variable input parameters.

THERMODYNAMIC ANALYSIS OF IRON OXIDES REDUCTION USING CARBON AND WATER VAPOUR

Thermodynamic analysis was performed for complete reduction of iron oxide during heating the initial system «Fe3O4 (eo mol) – H2O (bo mol) – C (excess) » with isothermal exposure. By the nature of ongoing reactions, processes in the system can be divided into four stages. Carbon gasification by water vapor at temperatures below 880 K activates water gas reaction and CO dissociation to form black carbon. Composition of the resulting H2 – H2O – CO – CO2 gas mixture depends only on the temperature. The consumption of carbon at 880 K is ~0,4446 moles on 1 mole of water. Reduction of Fe3O4 to wustite FeO1+x with varying degrees of oxidation occurs in the temperature range 880 – 917 K. Hydrogen reduces oxide at temperatures above 888 K. The percentage part of a whole oxide Fe3O4 reduced by hydrogen into this temperature range increases from zero to ~63 %. The total number of Fe3O4, reduced to wustite at 917 K is ~123 moles for 1 mole of water. It is possible only with repeated regeneration of reductants CO and H2 according to the reactions of carbon gasification by water vapor and by dioxide CO2. The carbon expense is about 78 moles. Wustite FeO1.092 formed at 917 K can be reduced by monoxide CO only at temperatures of 917 – 955 K to wustite FeO1.054 with a lower degree of oxidation. Carbon is gasified only by dioxide CO2, the carbon expense is approximately 18 moles. When isothermal exposure is ~955 K, wustite is reduced to iron. Wustite can be reduced only by carbon monoxide. The carbon expense is approximately 257 mol. For full reduction of 123 mol of Fe3O4 in a mixture with an excess of carbon in a closed system at 1 atm, 1 mole of water is sufficient. The total carbon consumption is ~353 moles for obtaining 368 moles of Fe, or ~0.21 kg/kg iron.

Reduction of Iron Oxides by Carbon and Water Vapor

The complete reduction of iron oxide on heating the initial Fe3O4–H2O–C system with isothermal holding is subjected to thermodynamic analysis. (Note that the initial system contains eo moles of Fe3O4 and bo moles of H2O, with excess carbon.) The processes in the system may be divided into four stages. First, the gasification of carbon by water vapor at temperatures below 880 K activates the reaction of the water gas and the dissociation of CO with the formation of lamp black (solid carbon). The composition of the H2–H2O–CO–CO2 gas mixture obtained depends only on the temperature. The carbon consumption at 880 K is ~0.445 mole per mole of water. The second stage, in the range 880–917 K, is the reduction of Fe3O4 to wustite FeO1+x with different degrees of oxidation. Hydrogen reduces the oxide at temperatures above 888 K. The proportion of the oxide reduced by hydrogen in this temperature range increases from zero to ~63%. The total quantity of Fe3O4 reduced to wustite at 917 K is ~123 moles per mole of water. This is only possible with repeated regeneration of the reducing agents CO and H2 as a result of the gasification of carbon by water vapor and carbon dioxide CO2. The carbon consumption is approximately 78 moles. In the third stage, the wustite FeO1.092 is reduced solely by carbon monoxide CO in the range 917–955°C to wustite FeO1.054, with a lower degree of oxidation. The carbon is only gasified by CO2; the carbon consumption is around 18 moles. In the fourth stage, with isothermal holding at ~955 K, the wustite is reduced to iron by carbon monoxide alone. The carbon consumption is around 257 moles. In a closed system at 1 atm, 1 mole of water is sufficient for the complete reduction of around 123 moles of Fe3O4 in a mixture with excess carbon. The total carbon consumption is ~353 moles, with the production of 368 moles of Fe; that is, the carbon consumption is ~0.21 kg/kg of iron.

Gas Phase Oxidation of Carbon Monoxide by Sulfur Dioxide Radical Cation: Reaction Dynamics and Kinetic Trend With the Temperature.

Gas phase ion chemistry has fundamental and applicative purposes since it allows the study of the chemical processes in a solvent free environment and represents models for reactions occurring in the space at low and high temperatures. In this work the ion-molecule reaction of sulfur dioxide ion with carbon monoxide CO is investigated in a joint experimental and theoretical study. The reaction is a fast and exothermic chemical oxidation of CO into more stable CO2 by a metal free species, as , excited into ro-vibrational levels of the electronic ground state by synchrotron radiation. The results show that the reaction is hampered by the enhancement of internal energy of sulfur dioxide ion and the only ionic product is SO.+. The theoretical approach of variational transition state theory (VTST) based on density functional electronic structure calculations, shows an interesting and peculiar reaction dynamics of the interacting system along the reaction path. Two energy minima corresponding to [SO2–CO].+ and [OS–OCO].+ complexes are identified. These minima are separated by an intersystem crossing barrier which couples the bent 3B2 state of CO2 with C2v symmetry and the 1A1 state with linear D∞h symmetry. The spin and charge reorganization along the minimum energy path (MEP) are analyzed and eventually the charge and spin remain allocated to the SO.+ moiety and the stable CO2 molecule is easily produced. There is no bottleneck that slows down the reaction and the values of the rate coefficient k at different temperatures are calculated with capture theory. A value of 2.95 × 10−10 cm3s−1molecule−1 is obtained at 300 K in agreement with the literature experimental measurement of 3.00 × 10−10 ± 20% cm3s−1molecule−1, and a negative trend with temperature is predicted consistently with the experimental observations.

Analysis of Experimental Data on CO and N2O Interaction with CO2 Production Based on the Results of DFT Calculations

The exchange process between carbon monoxide and nitrous oxide CO + N2O $$ \rightleftarrows $$ СO2 + N2 resulting in СO2 formation is studied. The methods of quantum mechanics are used to calculate transition states, vibration frequencies and reaction pathways. The direct process of oxygen atom transfer and a multiple-step process via several intermediate complexes are considered. In the framework of the transition state theory, the constants of the forward and backward reactions are calculated. A critical analysis of experimental data available in the literature is carried out based on the comparison with the results of calculations The recommended rate constants are presented in the general Arrhenius form for a wide range of temperatures: 300–2500 K.

Effect of bio-based lubricant towards emissions and engine breakdown due to spark plug fouling in a two-stroke engine

Two-stroke also known as two-cycle gasoline engine is a spark ignition engine. Its uniqueness to the four-stroke engine is that this engine does not require lubricant sump, which makes construction lightweight and simple. Its lubricant is mixed with gasoline and burnt together during combustion. There are reports which stated that higher spark plug fouling is due to carbon deposition on the spark plug electrodes on a two-stroke engine when compared to the four-stroke. While many factors could have affected this situation, however, in this paper, the effect of mineral and bio-based lubricants towards carbon deposition and emissions are studied and reported. Idle, half and full throttle operation modes had been conducted on a two-stroke, 43 cubic centimeter engine. To keep combustion temperature below self-cleaning temperature on all three modes of operation, a zero-load test was utilized. This situation accelerates the deposition process as low temperature causes incomplete combustion. This could lead to the accumulation of char, unburned fuel, as well as condensed water and acids as the by-products blanket the spark plug electrodes and the exhaust system. Five samples had been prepared with a commercially available mineral lubricant (T0) as reference. Trimethylolpropane Trioleate, TMPTO derived from plant origin was used as the bio-based candidate. It was then mixed with T0 which created another four lubricant samples namely T10, T15, T20 and T50 with 10%, 15%, 20% and 50% TMPTO accordingly. Results show that mineral lubricant T0 delivers the lowest hydrocarbon HC, carbon monoxide CO and smoke opacity during idle and half throttle operations. However, it exhibits a greasy deposit on the spark plug circumference and dry carbon deposits on its insulator tip. T0 also emits a liquid residue at the exhaust manifold. T10 and T50 show a wet deposit blanketing both electrodes. Severe deposition was recorded by T50 that caused the engine to fail half way with its emissions had the worst recording. T15 and T20 exhibit only dry carbon deposition on the spark plug circumference. However, T20 has outperformed T15 in terms of emissions with lower CO and CO2 emissions during idling and half-throttling. With better emissions than T15 and better carbon deposition than mineral (T0), T20 could be proposed to be used as a commercial two-stroke lubricant.

Experimental Investigation of Diesel Engine Emissions Fueled with Binary and Ternary Blends of Diesel, Biodiesel, and Ethanol

Renewable fuels are a potential substitute for high pollutant fuels attained from conventional sources. Due to the complexity of the combustion process inside the engine, the use of renewable fuels can have a disadvantageous effect on the other emissions of the engine. Most of the researchers have focused on the use of renewable fuel in the internal combustion engine to study their effect on the engine emission but these studies are based on steady-state test and these tests can never correlate with the emission generated by the vehicle in a real-world scenario. The study has been performed to observe the effect of the use of biodiesel, ethanol and diesel blend while running the compression ignition engine in transient condition. Carbon monoxide CO, carbon dioxide CO 2, and oxides of nitrogen NOx were analyzed on a 2.289L diesel engine. The results showed that the use of ethanol in a fraction of 15% produce less amount of CO 2 , and NOx but a higher amount of CO in the exhaust. Use of biodiesel slightly decreases the CO emission in the exhaust while being operated at low and medium speed condition. While NOx and CO 2 emission increases due to the higher oxygen content in the biodiesel as well as due to a higher temperature in the exhaust. The study has also observed that ternary blends have helped in emission reduction while running the engine in transient condition.

Механизм диффузии монооксидов углерода и кремния в кристалле кубического карбида кремния

The basic processes are described occurring in the case of the diffusion of carbon monoxide CO and silicon monoxide SiO through a layer of single-crystal silicon carbide SiC. This problem arises when a single-crystal SiC layer is grown by the method of atom substitution due to the chemical reaction of a crystalline silicon substrate with CO gas. The reaction products are the epitaxial layer of SiC and the gas SiO. It has been shown that CO and SiO molecules decompose in SiC crystals. Oxygen atoms migrate through interstitials in the [110] direction only with an activation energy of 2.6 eV. The migration of Si and C atoms occurs by the vacancy mechanism in the corresponding sublattices with activation energies of 3.6 eV and 3.9 eV, respectively, and also in the [110] direction only.

Proposed Cone Calorimeter for Woven Carpet

It is necessary to achieve the best specifications in carpets that provide safety to human health in establishments and buildings. This can be achieved by reducing the emissions of toxic gases from combustion via controlling the carpets composition. This research presents a study on carpets behavior when burning samples with different mixing specifications to determine the combustion products by conducting a test using cone Calorimeter to determine the effect of different structures of the carpet on combustion products. The study includes the effect of both the quality of the material used and their different densities and thicknesses. The research provides an analysis of carpet combustion products from different emissions, such as the amount of carbon monoxide CO, the amount of carbon dioxide CO2, smoke density, heat of combustion, and the heat released rate. It is clear that the rate of heat released is uneven in samples with different percentages of mixing. The samples with higher mixing percentage of synthetic fibers give lower temperature while the samples with higher wool percentage give higher temperature. The temperature of combustion increases gradually with the increase of the percentage of wool while the density of the smoke decreases which achieves the required safety of carpets. In addition to this, the research proves the increase of both CO and CO2 as the percentage of synthetic fibers in products which confirms the necessity to avoid the adverse effects of these emissions on human health.

Varenicline for long term smoking cessation in patients with COPD

BackgroundQuitting smoking is key for patients with Chronic Obstructive Pulmonary Disease (COPD). Standard recommendations for quitting smoking are implemented for COPD as well. Varenicline Tartrate (VT) is the most effective drug to help quit smoking, but few studies have analysed its effectiveness.Aim of the study: To determine the Abstinence Rate (AR) at 12 months, in COPD and non-COPD smokers. MethodsObservational study in 31 COPD (post bronchodilator-BD FEV1/FVC <0.70) and in 63 non-COPD smokers, were invited to receive treatment with Varenicline Tartrate (VT). Fourteen subjects with COPD and 46 non-COPD subjects received additionally Cognitive-Behavioral Therapy (CBT). Abstinence rate (AR) was validated by exhaled carbon monoxide CO (COe), in addition to a phone or face-to-face interview. Motivation score was measured with a visual analogue scale (MS). ResultsDifferences between COPD and non-COPD, mean FEV1/FVC ratio 0.52 ± 0.10 vs. 0.90 ± 0.15, age 60 ± 10 vs. 47 ± 10 years, smoking pack-years 37 ± 3.5 vs. 22 ± 12, and COe 16 ± 11 vs. 12 ± 9 ppm were statistically significant (p < 0.05); for MS the score was 93 ± 11 vs. 93 ± 11 and for attempts to quit (AQ) 2 ± 2 vs. 2 ± 3 were not. AR was not significantly different at 12 months (61.2 vs. 42.8% p = 0.072). Motivation was the only significant one-year AR predictor. ConclusionsCOPD smokers had a similar response (higher tendency) to VT regardless of the presence of airflow obstruction and stronger nicotine addiction.

Multivariate air pollution classification in urban areas using mobile sensors and self-organizing maps

The main challenge regarding multivariate data is to transform and integrate this information into useful knowledge. In the case of the emerging vehicle as a sensor concept and its application on environmental assessment, the challenge arises from the possibility to board several types of sensors cheaply and, consequently, to gather information in high spatiotemporal frequency. In this sense, the main objective of this article is to categorize urban locations due to pollutants concentration, based on the spatial dependence of regionalized variables into the n-dimensional space, through self-organizing maps (SOM) technique. For this goal, we use a pollution dataset gathered by equipped vehicles in five trips in Sao Paulo, Brazil, comprising the following variables: four gas concentration parameters (carbon monoxide—CO, carbon dioxide—CO2, nitrogen dioxide—NO2, and ozone—O3), meteorological parameters (temperature and humidity), altitude and speed. As a first result, we obtain the correlation among considered variables. Afterward, we assess the average behavior of each variable considering only the pollutants, interpreted as a pollution signature, for each cluster obtained by SOM technique. Thus, each cluster is classified according to the air pollution signature. As the main result, by visualizing this proposed classification in a Geographic Information System, we relate the air quality to the urban landscape on the surroundings of the samples and to the time of the day when the sample was gathered. Concretely, for the dataset collected in Sao Paulo, the worst air conditions are related to non-green urban areas, large traffic corridors and traffic peak hours.