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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.
Select a date: Time Format: Select a Parameter:
   
Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
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Ozone Hourly Averages for Friday, August 17, 2018.
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 222211213314046494948 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
Valley - all times are in EST
10 312101211283032393843 NA 10 1 R Virginia DEQ
17 125391053410 PM34424241 NA 17 1 R Virginia DEQ
25  1 2200001251628374040 NA 25  1 1 R Virginia DEQ
26 000240012273240444338 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
Blue Ridge - all times are in EST
24 17131289268173049544340 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
Piedmont - all times are in EST
13 171217303510284250504544 FEW 13 1 R Virginia DEQ
14 473630213212835404041 NA 14 1 R Virginia DEQ
18 332223515284759666355 NA 18 1 R Virginia DEQ
19 911117846 PM304756534946 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 2425242219161625304045454745 NA 30 1 R Virginia DEQ
34 2218131312111118243036403838 NA 34 1 R Virginia DEQ
35 1716161244812172431343838 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 3432282316161523314553556254 NA 11 1 R Virginia DEQ
12 743324916263441433938 NA 12 1 R Virginia DEQ
15 3129242016131019273746515545 NA 15 1 R Virginia DEQ
16 211152811172731353436 FEW 16 1 R Virginia DEQ
20 19171714116914274451535452 NA 20 1 R Virginia DEQ
21  2 4242414141403941444442414039 NA 21  2 1 R Oth Gov
23 31111047 PM3843464749 NA 23 1 R Virginia DEQ
27 210000211254049463938 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.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a surrogate 8-hour average.
The table below shows the levels, color-coding, and suggested actions for the 8-hour surrogate.

Ozone levels in this range are projected to be moderate based on the eight-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive people should consider limiting prolonged outdoor exertion.

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.