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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 Thursday, August 17, 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 5:00 6:00 7:00 8:00 9:0010:00
Southwest - all times are in EST
28 2720158 PM66172831323332343639423936292617 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 5:00 6:00 7:00 8:00 9:0010:00
Valley - all times are in EST
10 4342 PM04152333525144414143443932312425 NA 10 1 R Virginia DEQ
17 1000 PM02162740474852504644434036292820 NA 17 1 R Virginia DEQ
25  1 5311 PM00818273739383736353434191073 NA 25  1 1 R Virginia DEQ
26 0000 PM0061839424346474141393431292521 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 5:00 6:00 7:00 8:00 9:0010:00
Blue Ridge - all times are in EST
24 221487 PM6812243543434344393431292718137 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 5:00 6:00 7:00 8:00 9:0010:00
Piedmont - all times are in EST
13 2081 PM1052102124 PM27322928303129262421 FEW 13 1 R Virginia DEQ
14 9435 PM0181930272733394038363123181614 NA 14 1 R Virginia DEQ
18 9654 PM1391832414940373840353425232322 NA 18 1 R Virginia DEQ
19 15151614 PM23 PM1936504742364444454133242218 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 5:00 6:00 7:00 8:00 9:0010:00
Tidewater - all times are in EST
30 9131412 PM107193748596684604639383835322928 FEW 30 1 R Virginia DEQ
34 11151413 PM91018294049 PM52484642403933312827 NA 34 1 R Virginia DEQ
35 5111010 PM141521 PM394244464035363123242419 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 5:00 6:00 7:00 8:00 9:0010:00
Northern - all times are in EST
11 40362820 PM1110253644474850494747434135353539 NA 11 1 R Virginia DEQ
12 3228198 PM43112439 PM PM45465047403838232216 NA 12 1 R Virginia DEQ
15 2718106 PM56223437384241403838353430312930 NA 15 1 R Virginia DEQ
16 91041 PM0162023273442404141384043463728 FEW 16 1 R Virginia DEQ
20 261811 PM PM33111836526258544748505051433433 NA 20 1 R Virginia DEQ
23 13105 PM PM13173039434246454141444143393533 NA 23 1 R Virginia DEQ
27 6347 PM32152635505144424442503926261915 NA 27 1 R Virginia DEQ
Notes:
- These sites are maintained and operated by USDA Forest 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.
Ozone levels in this range are projected to be unhealthy for sensitive groups based on the eight-hour surrogate calculation for Ozone.
  • Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with respiratory disease, such as asthma.
  • Active children and adults, and people with respiratory disease, such as asthma, should limit 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.