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Daily Maximum Eight-Hour Ozone Averages for October 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 2021 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 2021POCMonitoring Site
123456789101112131415161718
Clark County
Virgin Valley15254505038413836464352343842414547481Virgin Valley
Paul Meyer1555957474247474045475037NV40414650471Paul Meyer
Mountains Edge14950484237444137414546343640404549421Mountains Edge
Walter Johnson15560574944494740474652384040424551481Walter Johnson
Palo Verde1546057494349NV39464450NV3839404652471Palo Verde
Joe Neal1545854494451483847445038NV42424551471Joe Neal
Green Valley1525452464246454145455037NV39404249461Green Valley
Liberty High School15153514639454137434447353639394246401Liberty High School
Jerome Mack1515350424045453645444836NV38404344431Jerome Mack
Garrett Junior High15456535244475141494352404243444650491Garrett Junior High
Jean157565452NVNANANV464852374142424852491Jean
Walnut15356524843484637464448353937384346431Walnut
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.