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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 Friday, December 15, 2017.
measured in parts per billion
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Southwest - all times are in EST
28 1111 PM11127121212151620 FEW 28 1 R Virginia DEQ
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Valley - all times are in EST
10 1010913 PM2518242525262627272620 NA 10 1 R Virginia DEQ
17 2425223 PM2519202027272727251916 NA 17 1 R Virginia DEQ
25  1 7142020 PM2121212122222121212118 NA 25  1 1 R Virginia DEQ
26 00411 PM1413838192020181816 FEW 26 1 R Virginia DEQ
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Blue Ridge - all times are in EST
24 421220 PM1917171920212318141319 FEW 24 1 R Virginia DEQ
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Piedmont - all times are in EST
13 20212122 PM222222 PM28292929272622 FEW 13 1 R Virginia DEQ
14 18202119 PM2120211520232425232424 NA 14 1 R Virginia DEQ
18 21202223 PM2424262931313030313130 NA 18 1 R Virginia DEQ
19 16171921 PM2322222426282928282423 NA 19 1 R Virginia DEQ
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Tidewater - all times are in EST
30 27272728 PM3029292928292930302827 FEW 30 1 R Virginia DEQ
34 26272828 PM2727272419252226272727 NA 34 1 R Virginia DEQ
35 25262627 PM2626232525252526262728 FEW 35 1 R Virginia DEQ
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00
Northern - all times are in EST
11 29302928 PM2623192125221812131410 NA 11 1 R Virginia DEQ
12 17202322 PM2326272932 PM2830282425 NA 12 1 R Virginia DEQ
15 27282930 PM2727272932312419121110 NA 15 1 R Virginia DEQ
16 30292623 PM2018171627312825222224 FEW 16 1 R Virginia DEQ
20 282317 PM PM015151517181816161310 NA 20 1 R Virginia DEQ
21  2 21192021222223232424242424232321 NA 21  2 1 R Oth Gov
23 312926 PM PM1917192124262625222017 NA 23 1 R Virginia DEQ
27 23181926 PM2929313132323228262527 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.