Abstract
This study present extensive review on the atmospheric non methane hydrocarbons for the monitoring technology, source profile, and variability studies which have been done by various researchers at different research and development institutions all over the India. Most of the studies have reported that the concentration level in the urban environment is elevated at alarming level due to vehicular emission, refinery operation, secondary industrial process, LPG leakage and biomass burning. The elevated ambient concentration of NMHCs in an urban environment has a significant impact on climate change and human health. NMHCs levels are to be removed and limit the emission by using newer technology under specific industrial and practical conditions in the present time. This review aims at a summarizing discussion on the entire areas which come underneath the umbrella of NMHCs technologies and helpful to the future researchers and those findings will be helped to the formulate policies and implement for the enhancement of air quality in India.
Highlights
In the present scenario urban air pollution becomes a prime concern across the world in both developed and developing countries
We look into the global scenario, various researchers are going on nonmethane hydrocarbons (NMHCs) by researchers, organizations have discussed in the above, while no one have established the standard for NMHCs, even EPA is not proposed any standard for ambient NMHCs
They found most of the NMHC in the urban environment of Delhi, was emitted from vehicular exhaust (23%), polymer manufacturing industries (19%), refinery operation/ gas station(14%), flare emissions(13%), natural gas emissions (10%), secondary industrial process, including paints, body soaps and metal fabricator and processing (8%) and remaining 13% from an unidentified source. Scope This extensive review has focussed on the measurement, monitoring, source profile analysis of NMHCs and their role in tropospheric ozone formation
Summary
In the present scenario urban air pollution becomes a prime concern across the world in both developed and developing countries. Methane is excluded from this group of chemicals due to its large emissions, low reactivity with OH radical as compared to NMHCs and its direct role in climate change[3] The concentration of these compounds in the ambient atmosphere assumes special significance on account of the critical role they play in the atmospheric photochemistry and the adverse impacts they have on human health. They are highly reactive species because of their strong tendency to get oxidized by the OH radical and ozone present in the atmosphere 3. NMHCs
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