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Peak Daily One-Hour Ozone Averages for August 2018

The table below lists the peak daily one-hour ozone concentrations measured in August 2018 in each community where the DAQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
1234567891011121314151617181920
Clark County
Apex181686972768280705764737772686255657568651Apex
Mesquite167596065646765635657636664585451495358551Mesquite
Paul Meyer173647475748684747073766980696269637672581Paul Meyer
Walter Johnson179657974768485767572767385696668657572591Walter Johnson
Palo Verde165587276727877696870716677646166616766551Palo Verde
Joe Neal179707775738884777971787987777564717369601Joe Neal
Green Valley182626870717881626369777068736657597470621Green Valley
Jerome Mack179686668727881646461766867716653637669621Jerome Mack
Boulder City164586268686562514556626963605451526159541Boulder City
Jean166616375676867766670756765656055596265621Jean
Indian Springs171597369657273726879726565625756525755641Indian Springs

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.