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Google Maps: Fine Particulate Matter PM2.5 2003-2011 Average [KML] [iframe] 

Map uploaded on October 8, 2016.

The Outdoor Air Quality - Fine Particulate Matter data available on CDC WONDER are geographically aggregated daily measures of fine particulate matter in the outdoor air, spanning the years 2003-2011. PM2.5 particles are air pollutants with an aerodynamic diameter less than 2.5 micrometers. Reported measures are the daily measure of fine particulate matter in micrograms per cubic meter (PM2.5) (µg/m³), the number of observations, minimum and maximum range value, and standard deviation. Data are available by place (combined 48 contiguous states plus the District of Columbia, region, division, state, county), time (year, month, day) and specified fine particulate matter (µg/m³)value. County-level and higher data are aggregated from 10 kilometer square spatial resolution grids.

https://wonder.cdc.gov/controller/datarequest/D73

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