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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.

In general, 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  
Highlight validated data (Validated data has been manually reviewed by a data validator)
Select a Region:

Ozone Hourly Averages for Tuesday, January 19, 2021.
measured in parts per billion
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
Clark County - all times are in PST
24  1 SPN2631302627333134343637373838 FEW NA 24  1 1 N DAQ
43  1 SPN3434353434323232333436363636 FEW NA 43  1 1 R DAQ
44  1 SPN3636363635343234353637383838 FEW NA 44  1 1 R DAQ
71  1 SPN3939403939383737383940414141 FEW NA 71  1 1 R DAQ
73  1 SPN3938393938383838383940394040 FEW NA 73  1 1 R DAQ
75  1 SPN3838383837373536 PM CAL CAL CAL3838 FEW NA 75  1 1 R DAQ
298  1 SPN3735353432292627303435363736 FEW NA 298  1 1 R DAQ
540  1 SPN3233333231282729323435 PM3636 FEW NA 540  1 1 R DAQ
601  1 SPN3738383737363635363637383939 FEW NA 601  1 1 R DAQ
1019  1 SPN3737353537393638383838393940 FEW NA 1019  1 1 R DAQ
- These sites are maintained and operated by Clark County Department of Air Quality.

DAQ 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.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

PLEASE NOTE: This data has not been verified by the Clark County Department of Air Quality 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 Clark County Department of Air Quality 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.