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Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

Higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter and to control cell highlighting based on measured Ozone levels. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
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Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
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Ozone Hourly Averages for Tuesday, April 23, 2019.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Southwest - all times are in EST
28 888875 FEW NA 28 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Valley - all times are in EST
10 181514131211 FEW NA 10 1 R Virginia DEQ
17 393321850 FEW NA 17 1 R Virginia DEQ
25  1 2118151286 FEW NA 25  1 1 R Virginia DEQ
26 100001 FEW NA 26 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Blue Ridge - all times are in EST
24 262364812 FEW NA 24 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Piedmont - all times are in EST
13 1097437 FEW NA 13 1 R Virginia DEQ
14 78714101 FEW NA 14 1 R Virginia DEQ
18 13117543 FEW NA 18 1 R Virginia DEQ
19 002100 FEW NA 19 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Tidewater - all times are in EST
30 101923242317 FEW NA 30 1 R Virginia DEQ
34 182017172317 FEW NA 34 1 R Virginia DEQ
35 1514111096 FEW NA 35 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00
Northern - all times are in EST
11 1110101273 FEW NA 11 1 R Virginia DEQ
12 171917161210 FEW NA 12 1 R Virginia DEQ
15 283029171713 FEW NA 15 1 R Virginia DEQ
16 202019191512 FEW NA 16 1 R Virginia DEQ
20 393425202419 FEW NA 20 1 R Virginia DEQ
21  2 535353535453 FEW NA 21  2 1 R Oth Gov
23 12161616117 FEW NA 23 1 R Virginia DEQ
27 19252215109 FEW NA 27 1 R Virginia DEQ
Notes:
- These sites are maintained and operated by USDA Forest Service.
- These sites are maintained and operated by the National Park Service.

Virginia DEQ does not certify the validity or quality of data it hosts from other monitoring entities.
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the Virginia DEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from Virginia DEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.