Downtown Pittsburgh Research Articles

Apportionment of Ambient Primary and Secondary Fine Particulate Matter during a 2001 Summer Intensive Study at the CMU Supersite and NETL Pittsburgh Site

Gaseous and particulate pollutant concentrations associated with five samples per day collected during a July 2001 summer intensive study at the Pittsburgh Carnegie Mellon University (CMU) Supersite were used to apportion fine particulate matter (PM2.5) into primary and secondary contributions using PMF2. Input to the PMF2 analysis included the concentrations of PM2.5 nonvolatile and semivolatile organic material, elemental carbon (EC), ammonium sulfate, trace element components, gas-phase organic material, and NO(x), NO2, and O3 concentrations. A total of 10 factors were identified. These factors are associated with emissions from various sources and facilities including crustal material, gasoline combustion, diesel combustion, and three nearby sources high in trace metals. In addition, four secondary sources were identified, three of which were associated with secondary products of local emissions and were dominated by organic material and one of which was dominated by secondary ammonium sulfate transported to the CMU site from the west and southwest. The three largest contributors to PM2.5 were secondary transported material (dominated by ammonium sulfate) from the west and southwest (49%), secondary material formed during midday photochemical processes (24%), and gasoline combustion emissions (11%). The other seven sources accounted for the remaining 16% of the PM2.5. Results obtained at the CMU site were comparable to results previously reported at the National Energy Technology Laboratory (NETL), located approximately 18 km south of downtown Pittsburgh. The major contributor at both sites was material transported from the west and southwest. Some difference in nearby sources could be attributed to meteorology as evaluated by HYSPLIT model back-trajectory calculations. These findings are consistent with the majority of the secondary ammonium sulfate in the Pittsburgh area being the result of contributions from distant transport, and thus decoupled from local activity involving organic pollutants in the metropolitan area. In contrast, the major local secondary sources were dominated by organic material.

The Future of the Dag

DAGUERREOTYPES PAST AND PRESENT DAGUERREIAN SOCIETY GALLERY PITTSBURGH APRIL 21-MAY 5, 2007 In an unassuming building a few minutes drive from downtown Pittsburgh was an exhibition of unexpected depth and magnitude. As the title suggests, Daguerreotypes Past and Present displayed historic images alongside the work of two contemporary daguerreotypists, Toronto's Mike Robinson and Jerry Spagnoli from New York City. The show provided viewers with the rare opportunity to be immersed in what many believe is the long-forgotten art of the daguerreotype--though this exhibition confirmed quite the opposite. Robinson and Spagnoli successfully employ this nineteenth-century process in their contemporary artistic exploration of time. Daguerreotypes Past and Present, curated by the Daguerreian Society's outgoing president Mark Johnson, was displayed in a three-room gallery housed in a former residence serving as the society's headquarters. Developed in 1839 by Louis Jacques Mande Daguerre, the daguerreotype was the first recorded image produced with a camera obscura. The daguerreotype experienced a short-lived popularity--about two decades in the United States--before being superseded by other photographic processes. Today, only a few have mastered the nearly obsolete art of daguerreotypy. These artists face innumerable challenges, including the toxic and highly volatile vapors of mercury and bromine. In the central room of the Daguerreian Society Gallery was Spagnoli's Untitled Botanical Study (2001), an impressive triptych of whole plate daguerreotypes that eloquently captures a delicate pattern of intertwining tree branches. Spagnoli's triptych hung framed on the wall above a display case that held a combination of smaller historic and contemporary daguerreotypes of outdoor scenes. [ILLUSTRATION OMITTED] The exhibition's greatest strength lay in the juxtaposition of the historic with the contemporary as daguerreotypes past and present confronted the viewer side by side. Most of the historic images were grouped thematically in display cases around the perimeter of the front room where the history and technical details of the medium were explained. Some cases displayed daguerreotypes that helped illustrate the technical aspects of the work, such as plate sizes and hand tinting. Other cases presented groupings of similar subject matter, for example, images of children and postmortems. The emotional potency of these unique images highlights their intended function to capture the memory of a fleeting moment. …

English

On 01/25/05, a 10,000-gpm blowout of the century-old Nickle Plate Mine (Pittsburgh coalbed) occurred in a public sidewalk about 12 miles southwest of downtown Pittsburgh, PA. The US Office of Surface Mining, first responder, installed diesel pumps and drain lines along public streets to control and convey the discharge to a nearby stream. On 02/22/05, the Pennsylvania Department of Environmental Protection, Bureau of Abandoned Mine Reclamation issued a 90-day emergency contract to Environmentally Innovative Solutions, LLC to provide a permanent control. With numerous partners (federal, state, local agencies; local residents and businesses), property access, stream and mine pool water quality data, historical mine mapping, and other pertinent site information were acquired. Nine options were developed and evaluated. Paramount in design considerations was public health and safety followed by effectiveness, reliability, community and environmental impact, long-term maintenance requirements, installation cost, and aiding future work including grouting to address mine subsidence issues and treatment of the abandoned mine drainage. Piezometers and test pits were installed in city streets, private driveways, and on undeveloped property and mine pool response tests were conducted. After data evaluation, the mine pool was manipulated to discharge about ½-mile northeast of the blowout on undeveloped land to an AMD-degraded receiving stream. By 05/20/05, a primary gravity drain, a secondary drain, and an early warning system at the blowout had been completed. Subsequent monitoring confirms the facilities are functioning as designed.

Predicting Emergency Evacuation and Sheltering Behavior: A Structured Analytical Approach

We offer a general approach to predicting public compliance with emergency recommendations. It begins with a formal risk assessment of an anticipated emergency, whose parameters include factors potentially affecting and affected by behavior, as identified by social science research. Standard procedures are used to elicit scientific experts' judgments regarding these behaviors and dependencies, in the context of an emergency scenario. Their judgments are used to refine the model and scenario, enabling local emergency coordinators to predict the behavior of citizens in their area. The approach is illustrated with a case study involving a radiological dispersion device (RDD) exploded in downtown Pittsburgh, PA. Both groups of experts (national and local) predicted approximately 80-90% compliance with an order to evacuate workplaces and 60-70% compliance with an order to shelter in place at home. They predicted 10% lower compliance for people asked to shelter at the office or to evacuate their homes. They predicted 10% lower compliance should the media be skeptical, rather than supportive. They also identified preparatory policies that could improve public compliance by 20-30%. We consider the implications of these results for improving emergency risk assessment models and for anticipating and improving preparedness for disasters, using Hurricane Katrina as a further case in point.

Apportionment of Ambient Primary and Secondary Pollutants during a 2001 Summer Study in Pittsburgh Using U.S. Environmental Protection Agency UNMIX

Apportionment of primary and secondary pollutants during the summer 2001 Pittsburgh Air Quality Study (PAQS) is reported. Several sites were included in PAQS, with the main site (the supersite) adjacent to the Carnegie Mellon University campus in Schenley Park. One of the additional sampling sites was located at the National Energy Technology Laboratory, located ∼18 km southeast of downtown Pittsburgh. Fine particulate matter (PM2.5) mass, gas-phase volatile organic material (VOM), particulate semivolatile and nonvolatile organic material (NVOM), and ammonium sulfate were apportioned at the two sites into their primary and secondary contributions using the U.S. Environmental Protection Agency UNMIX 2.3 multivariate receptor modeling and analysis software. A portion of each of these species was identified as originating from gasoline and diesel primary mobile sources. Some of the organic material was formed from local secondary transformation processes, whereas the great majority of the secondary sulfate was associated with regional transformation contributions. The results indicated that the diurnal patterns of secondary gas-phase VOM and particulate semivolatile and NVOM were not correlated with secondary ammonium sulfate contributions but were associated with separate formation pathways. These findings are consistent with the bulk of the secondary ammonium sulfate in the Pittsburgh area being the result of contributions from distant transport and, thus, decoupled from local activity involving organic pollutants in the metropolitan area.

Water content of ambient aerosol during the Pittsburgh Air Quality Study

The aerosol water content and volumetric growth factors of fine particulate matter were measured during July–August 2001 and January–June 2002 in an urban park about 6 km from downtown Pittsburgh, Pennsylvania. Most of the aerosol during the study was transported to the region from other areas, and its composition and concentration were characteristic of the regional particulate matter in the northeastern United States. During the summer months the ambient aerosol practically always contained water even when the relative humidity (RH) was as low as 30%. In contrast, during the winter the aerosol was dry below 60% RH. The spring months were characterized by a transitional behavior between these two states. The observed seasonal behavior can be explained by the aerosol acidity. The summer aerosol was acidic and retained water at low RH. The winter aerosol was neutral and became wet when the relative humidity reached the deliquescence point of ammonium nitrate. The observations during July 2001 were compared with the predictions of the thermodynamic Gibbs Free Energy Minimization (GFEMN) model and the aerosol inorganics model (AIM), neglecting the organic aerosol contribution to water absorption. The models under‐predicted water concentrations by about 35%, but no clear correlation between organic mass and the excess water was observed. On average, the contribution of the organics to water absorption appeared to be higher during the afternoon hours and when the aerosol was presumably more oxidized.

Industrial suburbs and the growth of metropolitan Pittsburgh, 1870–1920

In 1907, the Pittsburgh Survey team recognized that dispersed industrial development had created a metropolitan area stretching 30 to 50 miles from downtown Pittsburgh. Traditional interpretations of metropolitan formation fail to account for the crucial role of industry in this process. Beginning in the 1870s, the transformation from small, craft organized factories to integrated mills, mass production, and modern management organization in steel and other industries led many manufacturers to search for large sites with railroad and river accessibility. They purchased land, designed modern plants, and sometimes built towns for workers. Other firms bought into new communities begun as speculative industrial real estate ventures. Some owners removed their plants from the city's labour politics to exert greater control over workers. The region's rugged topography and dispersed natural resources of coal and gas accentuated this dispersal. The rapid growth of steel, glass, railroad equipment and coke industries resulted in both large mass-production plants and numerous smaller firms. As capital deepened and interdependence grew, participants multiplied, economies accrued, the division of labour increased, and localized production systems formed around these industries. Transportation, capital, labour markets, and the division of labour in production bound the scattered industrial plants and communities into a sprawling metropolitan district. By 1910 the Pittsburgh district was a complex urban landscape with a dominant central city, surrounded by proximate residential communities, mill towns, satellite cities, and hundreds of mining towns.

From Child Development to Community Development: One Agency's Journey

Sheldon Park is a public housing community in the northeast corner of Allegheny County 25 miles from downtown Pittsburgh, Pennsylvania. It consists of 192 units of back-to-back townhouses situated on both sides of an oval road winding through the housing community. Most buildings contain four to six townhouses. The community has large grassy areas with shade trees at the front and back of each unit. In the center of the community is the Community Building, a one-story structure with a large, open activity area, a kitchen, and several meeting rooms.

Corrosion and Fatigue Resistance Study of Aluminum Bridge Deck

Thousands of bridges on which the U.S. transportation system depends are in need of repair or replacement. Engineers are continually looking for materials that can significantly extend the lives of these structures. The use of lightweight materials such as aluminum could often avoid the cost of the replacement of the sound foundations and steel girders of bridges listed as structurally deficient. However, bridge engineers have not considered aluminum for use as a bridge material because of a lack of information on the in-service performance of existing aluminum bridges and a lack of knowledge about the metal's lower life-cycle costs compared with those of traditional materials. The reconfiguration of the Smithfield Bridge in downtown Pittsburgh from a mass transit-highway bridge to a highway-traffic bridge presented an opportunity for Reynolds Metals Company to analyze the corrosion and fatigue performance of the almost 30-year-old deck and the more than 60-year-old cross members. The results of the study indicate that aluminum is a viable material for bridge decks when it is properly designed into the application.

Corrosion and Fatigue Resistance Study of Aluminum Bridge Deck

Thousands of bridges on which the U.S. transportation system depends are in need of repair or replacement. Engineers are continually looking for materials that can significantly extend the lives of these structures. The use of lightweight materials such as aluminum could often avoid the cost of the replacement of the sound foundations and steel girders of bridges listed as structurally deficient. However, bridge engineers have not considered aluminum for use as a bridge material because of a lack of information on the in-service performance of existing aluminum bridges and a lack of knowledge about the metal's lower life-cycle costs compared with those of traditional materials. The reconfiguration of the Smithfield Bridge in downtown Pittsburgh from a mass transit–highway bridge to a highway-traffic bridge presented an opportunity for Reynolds Metals Company to analyze the corrosion and fatigue performance of the almost 30-year-old deck and the more than 60-year-old cross members. The results of the study indicate that aluminum is a viable material for bridge decks when it is properly designed into the application.