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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 Thursday, April 19, 2018.
measured in parts per billion
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Southwest - all times are in EST
28 5451515347464544 FEW 28 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Valley - all times are in EST
10 4243304139332322 NA 10 1 R Virginia DEQ
17 3227333730202834 NA 17 1 R Virginia DEQ
25  1 5458595956454445 NA 25  1 1 R Virginia DEQ
26 02221921182221 FEW 26 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Blue Ridge - all times are in EST
24 5357565452474442 FEW 24 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Piedmont - all times are in EST
13 2826191923323538 FEW 13 1 R Virginia DEQ
14 2317151824333237 NA 14 1 R Virginia DEQ
18 3021212230313231 NA 18 1 R Virginia DEQ
19 PM PM PM PM PM PM PM PM NA 19 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Tidewater - all times are in EST
30 3042444241393839 NA 30 1 R Virginia DEQ
34 4044413939404040 NA 34 1 R Virginia DEQ
35 4446444242414041 NA 35 1 R Virginia DEQ
RegionCAMSMorningCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00
Northern - all times are in EST
11 3935323133242318 NA 11 1 R Virginia DEQ
12 2828262937252421 NA 12 1 R Virginia DEQ
15 4038323236302018 NA 15 1 R Virginia DEQ
16 4031213033252220 FEW 16 1 R Virginia DEQ
20 3932313535312929 NA 20 1 R Virginia DEQ
21  2 5656474756555247 NA 21  2 1 R Oth Gov
23 2519293936302623 NA 23 1 R Virginia DEQ
27 4337293837302324 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.