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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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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