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Daily Maximum Eight-Hour Ozone Averages for September 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 2020 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 SitePOCSeptember 2020POCMonitoring Site
123456789101112131415161718192021222324252627282930
Clark County
Apex1433942445154474535454750465557NV5160455453NANV506357385249NA1Apex
Mesquite144454144454646353844494945525150NV585753534947475248445547NA1Mesquite
Paul Meyer15573686369635147425452665764646862654868555462606769425658NA1Paul Meyer
Walter Johnson15275666667585047405252625462636661634765555562626971425558NA1Walter Johnson
Palo Verde14563615959514742364647544955555855564558494954556166404652NA1Palo Verde
Joe Neal14963616161554845395052605262626260614862565661627075425057NA1Joe Neal
Green Valley14668564960614642384847575157576260614558545261566459385250NA1Green Valley
Jerome Mack1446655515858454236464658485359575359395653NANVNV6156355048NA1Jerome Mack
Boulder City1455548485857524740475154525764NVNV615260555456586159525852NA1Boulder City
Jean15448545153554745415450565457575958644858555152606363435655NA1Jean
Indian Springs1404042424854454242444748496055556159505152NV49546758374846NA1Indian 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.