Abstract
This chapter discusses the atmospheric aerosol concentration patterns. The background concentrations of sulfates in the atmosphere are compared with the levels seen in areas affected by industrialization to indicate the likely levels of combustion generated sulfates. The chapter describes the variation in ambient sulfate concentrations over short periods of time and with season. The chapter also discusses the relative importance of meteorological and pollution factors in determining ambient sulfate concentrations. The majority of the mass of sulfate aerosol is concentrated between 0.1 and 1 μm in diameter. It is found that because the appearance of elevated sulfate concentrations depends on a complex sum of chemical and meteorological factors, statistical methods have been used on air quality data to attempt to find the variables that best predict sulfate levels. Normal regression methods require independent variables but air quality and meteorological data are highly correlated because the data are measurements of different aspects of the same underlying physical and/or chemical processes.
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