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Peak Daily One-Hour Ozone Averages for April 2017

The table below lists the peak daily one-hour ozone concentrations measured in April 2017 in each community where the DAQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
Clark County
Apex141514851525858635259626560605863454556635753706559576755481Apex
Mesquite144435149514753635353566064585358444156615450686467505854431Mesquite
Paul Meyer143585657556559635663716560666464505066676058676757566963521Paul Meyer
Walter Johnson141555654566459645462666763606465534967676158707061587264531Walter Johnson
Palo Verde141535855546658635464716563616365514859635860696559557165521Palo Verde
Joe Neal142495654556059645364626461566465664966635855676960607192531Joe Neal
Green Valley140564951515957625361666160625962444964655752706059556957481Green Valley
Jerome Mack138544550504552585159595753585759454361635550666156536755451Jerome Mack
Boulder City14149525152535562535967645754NANA394159685752715959536859511Boulder City
Jean1NANANA58566459615562746557595764453956606155675660505456501Jean
JD Smith142554853545855625262595958606261445153645854676858586857481JD Smith
Indian Springs1NANANA5238NA50635762636171556063455158615457685956506458501Indian Springs
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.