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Daily Maximum Eight-Hour Ozone Averages for October 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 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 SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819
Clark County
Apex1634452NVNANANANANANANANANANANANANANANA1Apex
Mesquite149414342NVNANANANANANANANANANANANANANA1Mesquite
Paul Meyer1594453636144414336434755494748403626131Paul Meyer
Walter Johnson1654757656347464639NV4659505250433926191Walter Johnson
Palo Verde1624357616046474738444757505048444133221Palo Verde
Joe Neal1594554626145474937464858545248464532181Joe Neal
Green Valley160455263574542463743445751444640NV26121Green Valley
Jerome Mack162NV4759574440443744445449454638342171Jerome Mack
Boulder City1634452656344424638474962575148424632231Boulder City
Jean158455566534941473946NV54534851464442241Jean
JD Smith161445160594543453644NV5751454839362161JD Smith
Indian Springs151425355NVNANANANANANANANANANANANANANA1Indian 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.