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Daily Maximum Eight-Hour Ozone Averages for August 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 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 SitePOCAugust 2017POCMonitoring Site
12345678910111213141516171819
Clark County
Apex1535656526560515356525052535641444244461Apex
Mesquite1525052505651454347404347405341363636411Mesquite
Paul Meyer1636454496864555653464554525052424348451Paul Meyer
Walter Johnson1646858527165575750465059555155454753501Walter Johnson
Palo Verde1656657486766595553444858615253454650461Palo Verde
Joe Neal1607062497564595956515158555157474454511Joe Neal
Green Valley1525553526160525252464451565243394143441Green Valley
Jerome Mack1515652475957525355504249515149424145451Jerome Mack
Boulder City153555455605849NV53494551525339NV3942421Boulder City
Jean15152505761574750NV484552565139333542411Jean
JD Smith1535954496458525455504352515051423947461JD Smith
Indian Springs1515352436255555753535250575252444346511Indian 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).

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.