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Daily Maximum Eight-Hour Ozone Averages for March 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in March 2017 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 SitePOCMarch 2017POCMonitoring Site
12345678910111213141516171819202122232425262728
Clark County
Paul Meyer14343445455464040NV394348404843NANANANANANV524448525050NA1Paul Meyer
Walter Johnson14143405253433840374041443946404848504843365045NV545151NA1Walter Johnson
Palo Verde1434344545745364239424145404843515153514541534549535352NA1Palo Verde
Joe Neal1444643545446454541454245465145535254524438514748545252NA1Joe Neal
Green Valley14244405052454037353739434046424849484743374941485148NVNA1Green Valley
Jerome Mack1424343505045433835383943404542474746464234453944484542NA1Jerome Mack
Boulder City1414743505145NVNV40403944404646454649474340474450544847NA1Boulder City
Jean1414344515445443939434343435244434950484438504650515150NA1Jean
JD Smith1424344525346444139414144424744494950504337494447525047NA1JD Smith
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.