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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 Monday, October 18, 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 5:00 6:00 7:00 8:00 9:0010:00
Clark County - all times are in PST
24  1 45434443333637395052535147474545422630342315 FEW 24  1 1 R DAQ
43  1 55535148484746434345464544454443413518101822 FEW 43  1 1 R DAQ
44  1 50484644434340383839404243454643403427283436 FEW 44  1 1 R DAQ
71  1 52535148494947454544454447474645434138213029 FEW 71  1 1 R DAQ
73  1 52514949494947444243434244444242403525262931 FEW 73  1 1 R DAQ
75  1 51514742444649454545464650484747474139353241 FEW 75  1 1 R DAQ
298  1 51504948464345454444454546454343423521183540 FEW 298  1 1 R DAQ
299  1 45444342393839393839404142444438393631253436 FEW 299  1 1 R DAQ
540  1 4847464440404241414343434545434242342311128 FEW 540  1 1 R DAQ
602  1 525049494746464849484850515249 LOST LOST LOST LOST LOST NA NA NA 602  1 1 R DAQ
1019  1 51504947464946454446474851525352504543454140 FEW 1019  1 1 R DAQ
2003  1 45484645414042424142434444444241424030201925 FEW 2003  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.