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Daily Maximum Eight-Hour Ozone Averages for November 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in November 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 SitePOCNovember 2020POCMonitoring Site
123456789101112131415161718192021222324252627282930
Clark County
Paul Meyer139NV43464046444137NV3540494540343041NV31343639403137353033NA1Paul Meyer
Mountains Edge137NV464439464442403534405246413937454332333641413037343232NA1Mountains Edge
Walter Johnson1383444453944444136NV35374845393334424035353843423339363133NA1Walter Johnson
Palo Verde13430384137423734303029NV43403631NANV4034353742413439363233NA1Palo Verde
Joe Neal13634484438424339373536374243403232403935353839403537353333NA1Joe Neal
Green Valley133314045NV4643413634323647413428NVNV3932323331382935332929NA1Green Valley
Jerome Mack1312538363041403834343235424033NANV363224272933352533302321NA1Jerome Mack
Boulder City14040505040484743393941445044433644424338373942403939353437NA1Boulder City
Jean14040454641454442373736425145403738464137353943414337353233NA1Jean
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.