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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 Sunday, March 26, 2017.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Southwest - all times are in EST
28 40344140 PM413939434140 FEW 28 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Valley - all times are in EST
10 37373837 PM253236383939 FEW 10 1 R Virginia DEQ
17 27262733 PM343937363535 FEW 17 1 R Virginia DEQ
25  1 36343128 PM232019293742 FEW 25  1 1 R Virginia DEQ
26 3735227 PM71723283234 FEW 26 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Blue Ridge - all times are in EST
24 42424039 PM363434343540 FEW 24 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Piedmont - all times are in EST
13 1524194 PM232224262424 FEW 13 1 R Virginia DEQ
14 36343130 PM252324283439 FEW 14 1 R Virginia DEQ
18 32313027 PM131826283031 FEW 18 1 R Virginia DEQ
19 31272519 PM202123252931 FEW 19 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Tidewater - all times are in EST
30 36353433 PM323129353841 FEW 30 1 R Virginia DEQ
34 34343333 PM312830312731 FEW 34 1 R Virginia DEQ
35 36323127 PM262523303741 FEW 35 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00
Northern - all times are in EST
11 36404443 PM414037373737 FEW 11 1 R Virginia DEQ
12 32323437 PM393938383939 FEW 12 1 R Virginia DEQ
15 37384142 PM414140393939 FEW 15 1 R Virginia DEQ
16 42403935 PM403939383737 FEW 16 1 R Virginia DEQ
20 36 PM3338 PM404038363639 FEW 20 1 R Virginia DEQ
21  2 5051504942343133384040 FEW 21  2 1 R Oth Gov
23 373534 PM PM383840404039 FEW 23 1 R Virginia DEQ
27 35383840 PM424040404040 FEW 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.