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Daily Maximum Eight-Hour Ozone Averages for July 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in July 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 SitePOCJuly 2017POCMonitoring Site
12345678910111213141516171819202122
Clark County
Apex16162606958616263NVNV736862646754NV49475657NA1Apex
Mesquite1576253574953565256535956NV5354514744424647NA1Mesquite
Paul Meyer1646164705262696458586971656670584557445460NA1Paul Meyer
Walter Johnson1686366765866796861617474696872654959455560NA1Walter Johnson
Palo Verde1686467735865766762596674666670625160465459NA1Palo Verde
Joe Neal167636880587075716463NV73717276655160505866NA1Joe Neal
Green Valley16063667054626770NVNV73676364675347NVNANV58NA1Green Valley
Jerome Mack1565656675057646249486559585962464250425062NA1Jerome Mack
Boulder City1596264665254616060546764575862494542414848NA1Boulder City
Jean1606467655254576057576554625859604456405460NA1Jean
JD Smith1626163755564726856567065636669524254435265NA1JD Smith
Indian Springs1666469665356565759585957NVNANANANANANANANANA1Indian Springs
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.

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.