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evolution year run time base
before code cleaning
mean summer ozone (8hr max)
Mean of summer months (May-October) of the daily maximum 8-hour ozone concentration (ppm), averaged over three years (2012 to 2014).
annual mean PM2.5
annual mean concentration of PM2.5 (average of quarterly means, μg/m3), over three years (2012 to 2014).
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three year average daily pm2.5
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8hr ozone maxima averaged over three years
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pop dens census 2010