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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, February 19, 2019.
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
Southwest - all times are in EST
28 29293030302719142329293031 FEW NA 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
Valley - all times are in EST
10 30282624232521132027303334 PM NA 10 1 R Virginia DEQ
17 33363635323431313537394142 FEW NA 17 1 R Virginia DEQ
25  1 3031272523181961830303133 FEW NA 25  1 1 R Virginia DEQ
26 24262827201815172529293334 PM NA 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
Blue Ridge - all times are in EST
24 29303130262424152226293032 FEW NA 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
Piedmont - all times are in EST
13 2726252423242429 PM PM343537 FEW NA 13 1 R Virginia DEQ
14 22201915151112192531323335 FEW NA 14 1 R Virginia DEQ
18 27252321232325263334363940 FEW NA 18 1 R Virginia DEQ
19 26252119212428293234353638 FEW 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
Tidewater - all times are in EST
30 26272727283032364042 PM4241 FEW NA 30 1 R Virginia DEQ
34 25242525252627303536383937 FEW NA 34 1 R Virginia DEQ
35 29272523231919253035383940 FEW NA 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
Northern - all times are in EST
11 323334333737353435373839 PM PM NA 11 1 R Virginia DEQ
12 26262828283133343538394143 FEW NA 12 1 R Virginia DEQ
15 3034353535343233 PM PM383941 FEW NA 15 1 R Virginia DEQ
16 23242627292628313333343738 FEW NA 16 1 R Virginia DEQ
20 34373737363635353738383942 FEW NA 20 1 R Virginia DEQ
21  2 26272829313131333536373843 FEW NA 21  2 1 R Oth Gov
23 30343637373636353838404142 FEW NA 23 1 R Virginia DEQ
27 29293133343134353740414243 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.