Code Yellow Air Quality for Ozone in Roanoke on 5/5

Yesterday’s ozone levels hit a Code Yellow, with an 8-hour average of 67 ppb (parts per billion).  This is the highest concentration we’ve had in three years, but still significantly lower than the valley’s ozone levels a decade or so ago.

2015          Ozone       PM 2.5
Date Conc. AQI Conc. AQI
5/1 41 35 5.6 23
5/2 48 41 8.4 35
5/3 59 50 7.3 30
5/4 61 54 11.3 47
5/5 67 74 12.7 52
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