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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 Wednesday, June 20, 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
Clark County - all times are in PST
22  1 544842343432353843495155 FEW NA 22  1 1 R DAQ
23  1 242114161018233541465157 FEW NA 23  1 1 R DAQ
43  1 413836292027364350525967 FEW NA 43  1 1 R DAQ
71  1 464542413130354551546068 FEW NA 71  1 1 R DAQ
73  1 454143383529374047535862 FEW NA 73  1 1 R DAQ
75  1 414948414136364248535662 FEW NA 75  1 1 R DAQ
298  1 434140363117273846515559 FEW NA 298  1 1 R DAQ
540  1 713611825233445515557 FEW NA 540  1 1 R DAQ
601  1 575553544643444647495255 FEW NA 601  1 1 R DAQ
1019  1 434239453841474954556064 FEW NA 1019  1 1 R DAQ
7772  1 443635443934373837454647 FEW NA 7772  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.

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.