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Daily Maximum Eight-Hour Ozone Averages for June 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 2017 in each community where the DAQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight with AQI colors
AreaMonitoring SitePOCJune 2017POCMonitoring Site
12345678910111213141516171819202122
Clark County
Apex1NV5962576353586653566050616563686836416760701Apex
Mesquite1505452515248515758545547485450545035395255611Mesquite
Paul Meyer15664665756546566525556435467NV676445466154641Paul Meyer
Walter Johnson1556870595956656655575945527066737245496857731Walter Johnson
Palo Verde1556566595956656455605744536864756743496556731Palo Verde
Joe Neal1566569576059666454575748597368747242446558771Joe Neal
Green Valley1545964545649616351545845606562687242406557631Green Valley
Jerome Mack1505760505151595945485442576259656635366253601Jerome Mack
Boulder City15356585555465460515456475863606664483760NV661Boulder City
Jean158565455555164NVNVNANANV515764636349456458621Jean
JD Smith1516164545657636251555745606864717040416356661JD Smith
Indian Springs1566165576361646453566346535961574829406056601Indian Springs
Arden Peak4 NNA6160606057656754596150586763686848546774734Arden Peak
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
NA - Data not available.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 0.201 - 0.2011
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

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.