John G. Watson

PM10 standards and nontraditional particulate source controls: a summary of the A&WMA/EPA international specialty conference

An international specialty conference, jointly sponsored by the Air & Waste Management Association (AW (2) emissions source characterization; (3) source apportionment of nontraditional sources; (4) fugitive dust characterization and control technologies; (5) vegetative burning characterization and control technologies; (6) sources and controls of secondary aerosol and motor vehicle precursors; and (7...

Receptor Models and Measurements for Identifying and Quantifying Air Pollution Sources

Abstract Air pollution sources have spatial, temporal, and chemical patterns from a large number of individual emitters that are superimposed at a large number of receptors. For suspended particulate matter, particle size is also relevant to the source and its zone of influence. Because the number of individual emitters far exceeds the number of components in these patterns than can be practically measured, it is necessary to group sources into categories or types that have similar patterns. This chapter describes several receptor models in common use, identifies source and receptor characteristics used in these models, specifies available measurement methods used to quantify those characteristics, and discusses some of the uncertainties and false source identifications to be avoided in a receptor-modeling study. The emphasis is on particulate matter pollution, supplemented with commonly measured gaseous components.

Air Quality Study of High Ozone Levels in South California

Physical and chemical characteristics within the two distinct meteorological regimes, i.e., convective and stable atmospheric conditions in a complex highly urbanized terrain of the California South Coast Air Basin (CSCAB; the Los Angeles area) were investigated. The Community Multi-scale Air Quality (CMAQ) model was used with a horizontal resolution of 5 km × 5 km to produce the 3D fields of pollutant concentrations. Input meteorological fields were obtained by the MM5 numerical weather prediction model while the input emissions were provided by the Californian Environmental Protection Agency. Modeled meteorological surface parameters and their vertical profiles as well as modeled planetary boundary layer heights (PBL) were compared to the corresponding measurements. The CMAQ simulations of ozone concentrations were compared against the relatively large number of measurements from the CSCAB area. The main goal of the research was to identify the governing atmospheric processes and sources in the coastal area that contributed to the high levels of pollution and to investigate the air quality model’s capabilities to simulate the air quality in the complex topography.