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Daily Maximum Eight-Hour Ozone Averages for May 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 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 SitePOCMay 2019POCMonitoring Site
12345678910111213141516171819202122232425
Clark County
Apex1495156586146484642434350555854514950505055484245NA1Apex
Mesquite151515256NVNV454444414549505453514851504952514441NA1Mesquite
Paul Meyer15761626662NV515047495160625958545157525058514449NA1Paul Meyer
Walter Johnson1555961666548504945464959605857544956514958504348NA1Walter Johnson
Palo Verde1NV5553595743NV454241435657NANV494352464451443941NA1Palo Verde
Joe Neal1526062656750474946NANANANV5756534954515156514441NA1Joe Neal
Green Valley1566061646650515547515256596057555457535258514451NA1Green Valley
Jerome Mack1535759626547495344485054585955525154504856494350NA1Jerome Mack
Boulder City1525559626248485045474854565755565555535158514445NA1Boulder City
Jean1555961666450525048525558626059565058535357494545NA1Jean
Indian Springs14855626564514845474048486058555447565251564844NVNA1Indian 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.