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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 Friday, February 23, 2018.
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 5:00 6:00 7:00 8:00 9:0010:0011:00
Clark County - all times are in PST
43  1 4646443838394040374545454444424242413835384141 FEW 43  1 1 R DAQ
71  1 4747474038352317394646464545444444434041434343 FEW 71  1 1 R DAQ
73  1 4646454342402831424544434143404344424141424343 FEW 73  1 1 R DAQ
75  1 3126252523222032394242434343424342413937393937 FEW 75  1 1 R DAQ
298  1 4444444242383833343442454544444442403330303638 FEW 298  1 1 R DAQ
540  1 37362427372224203644454643394043383232353736 FEW 540  1 1 R DAQ
601  1 4746454443433937424445454648474545444543424244 FEW 601  1 1 R DAQ
1019  1 4746454443434243434445454544454646454235363840 FEW 1019  1 1 R DAQ
8000  2 46464643433939434544454647464646444443434342 FEW NA 8000  2 4 N Other
- These sites are maintained and operated by Clark County Department of Air Quality.
- These sites are maintained and operated by Paiute.

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.