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We will be performing maintenance on our servers starting in the afternoon on 10/17/2019 and continuing through the weekend. All functionality is expected by start of business on 10/21/2019

Daily Maximum Eight-Hour Ozone Averages for October 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 2019 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 2019POCMonitoring Site
12345678910111213141516
Clark County
Mesquite148NVNANANANANANANANANANANANANANA1Mesquite
Paul Meyer151526068534346505540434348NV44191Paul Meyer
Walter Johnson15252616955444548NV404444494644291Walter Johnson
Palo Verde149475462513942475439414246NV41301Palo Verde
Joe Neal153515365554244496038444247NV47371Joe Neal
Green Valley1555258625141455058394343464442101Green Valley
Jerome Mack1515052645039434754NV41394140NV11Jerome Mack
Boulder City1535550615342475356404446464544291Boulder City
Jean1535360NV5645465660414447505047331Jean
Indian Springs147NVNANANANANANANANANANANANANANA1Indian 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.