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Los Angeles County PM2.5 annual trend. Source: US EPA Air Quality System

Los Angeles County PM2.5 annual trend. Source: US EPA Air Quality System

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California County attainment status. Source: California Air Resources...
Los Angeles County PM2.5 annual trend. Source: US EPA Air Quality System
Annual average composition of PM2.5 in LA County for 2002–2003. Source:...
PM2.5 trend for monitors in Los Angeles County 1999–2009. Data source:...
+2 Annual means of LA County and control group
The abatement of particulate matter 2.5 in Los Angeles County: a counterfactual evaluation
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The ambient PM2.5 concentration in Los Angeles (LA) County has been on a decreasing trend since LA County was designated as a nonattainment area in 2005. However, whether the nonattainment assignment is the underlying cause of the county’s reductions in PM2.5 requires further empirical investigation. Traditional statistical approaches used to study...

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