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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, May 23, 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
Southwest - all times are in EST
28 2025101117222323222323202326262524 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
Valley - all times are in EST
10 11183028282724 PM2327323026242219202020 NA 10 1 R Virginia DEQ
17 515221798251221353335353633312923 NA 17 1 R Virginia DEQ
25  1 9742126 PM1819232221242521192321 NA 25  1 1 R Virginia DEQ
26 216553691626313134363429222017 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
Blue Ridge - all times are in EST
24 1312191914911151635353334323227221919 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
Piedmont - all times are in EST
13 54610131011 PM PM23252325272626262626 FEW 13 1 R Virginia DEQ
14 002815151191318 PM2121222424242423 NA 14 1 R Virginia DEQ
18 0002788131720212323292926242223 NA 18 1 R Virginia DEQ
19 1134121513101721252626283230272624 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
Tidewater - all times are in EST
30 943615272728282731 PM32323434323232 FEW 30 1 R Virginia DEQ
34 46611132325252423252626282930313332 NA 34 1 R Virginia DEQ
35 104109111324252324262829 FEW LOST LOST NA NA 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 3:00 4:00 5:00 6:00 7:00
Northern - all times are in EST
11 281620171616121316242625262423232528 NA 11 1 R Virginia DEQ
12 3921222117151920 PM212224242221222124 NA 12 1 R Virginia DEQ
15 3122427241617131417222325262626262725 NA 15 1 R Virginia DEQ
16 162421212622221816211920 PM22182118138 FEW 16 1 R Virginia DEQ
20 35332624201814162225232123252624222219 NA 20 1 R Virginia DEQ
21  2 4044464849443943444038 PM42403530302828 NA 21  2 1 R Oth Gov
23 30403939353232283026232327262627252221 NA 23 1 R Virginia DEQ
27 4273335332320181822222224232424222224 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.