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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 Thursday, June 22, 2017.
measured in parts per billion
RegionCAMSMorningAfternoonCAMSPOCEntity
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
22  1 212028 SPZ342531455261687470757468677163545727 FEW 22  1 1 R DAQ
23  1 272626 SPZ172119334350526263606060636557403132 FEW 23  1 1 R DAQ
43  1 354755 SPZ261830455262727571625857585756565755 FEW 43  1 1 R DAQ
71  1 553931 SPZ342635485668767882726874666261606060 FEW 71  1 1 R DAQ
73  1 546352 SPZ363450636771747479757969636161596060 FEW 73  1 1 R DAQ
75  1 343323 SPZ444144475363767880848278766958555036 FEW 75  1 1 R DAQ
298  1 566570 SPZ475254566765727162605757575758525351 FEW 298  1 1 R DAQ
540  1 29149 SPZ137254757626970625655565554504541 FEW 540  1 1 R DAQ
601  1 525862 SPZ6247 SPN677073706562565758595962626154 FEW 601  1 1 R DAQ
1019  1 605357 SPZ484560616669646160575559626361565452 FEW 1019  1 1 R DAQ
2002  1 41118 SPZ23122451 FEW677273726260625754504540 FEW 2002  1 1 R DAQ
7772  1 414037 SPZ353446595864646060595655585758555960 FEW 7772  1 1 R DAQ
7778  1 757979 SPZ767473696768656161575659575962616258 FEW 7778  1 4 N DAQ
8000  2 LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM 8000  2 4 N Other
Notes:
- 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.
† - This is an experimental measurement and readings may not be indicative of ambient conditions.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a set of surrogate values based on custom 1-hour breakpoints.
The table below shows the levels, color-coding, and suggested actions for the 1-hour surrogate.

Ozone levels in this range are projected to be moderate based on the one-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive individuals may experience respiratory symptoms.
Ozone levels in this range are projected to be unhealthy for sensitive groups based on the one-hour surrogate calculation for Ozone.
  • Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with respiratory disease, such as asthma.
  • Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with respiratory disease, such as asthma.

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.