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Daily Maximum Eight-Hour Ozone Averages for August 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 2018 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 2018POCMonitoring Site
123456789101112131415161718192021
Clark County
Apex17462656970747163546067716763575258646260481Apex
Mesquite16356566061626154525357636056514746505652421Mesquite
Paul Meyer16655676866797366666972666762545957696455521Paul Meyer
Walter Johnson16857726868777468706972676662556058696355521Walter Johnson
Palo Verde16251646764726762646668616157525553635951461Palo Verde
Joe Neal16856696768767464736870707067615964686553471Joe Neal
Green Valley17258656667747256566271666465565256706657561Green Valley
Jerome Mack17058636567717156575767656264565059706257521Jerome Mack
Boulder City16254596364625847445460666057494949595751431Boulder City
Jean164NV606966656468626672626262534955616257531Jean
Indian Springs16356676662666469636870615957545249545358461Indian 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.