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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, June 23, 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
Clark County - all times are in PST
22  1 23392935363740434750515253 FEW NA 22  1 1 R DAQ
23  1 30201619151518344550525151 FEW NA 23  1 1 R DAQ
43  1 57503323181426324050586978 FEW NA 43  1 1 R DAQ
71  1 60423832261602 PM CAL CAL CAL82 FEW NA 71  1 1 R DAQ
73  1 62485244403336404748566680 FEW NA 73  1 1 R DAQ
75  1 39444640403940414650576471 FEW NA 75  1 1 R DAQ
298  1 53555333262535414547495565 FEW NA 298  1 1 R DAQ
540  1 37231324102431 PM PM48495459 FEW NA 540  1 1 R DAQ
601  1 5146404538313742454850 FEW53 FEW NA 601  1 1 R DAQ
1019  1 52494853463649524751596464 FEW NA 1019  1 1 R DAQ
2002  1 1372719182733384349546167 FEW NA 2002  1 1 R DAQ
7772  1 46434038373533414345464647 FEW NA 7772  1 1 R DAQ
7778  1 61636358464646454750525565 FEW NA 7778  1 4 N DAQ
8000  2 LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM NA 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.