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Peak Daily One-Hour Ozone Averages for September 2017

The table below lists the peak daily one-hour ozone concentrations measured in September 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 SitePOCSeptember 2017POCMonitoring Site
123456789101112131415161718192021222324
Clark County
Apex15761576068696054555352463972655758655860495144431Apex
Mesquite15256485052505350494847413559495151565654484641381Mesquite
Paul Meyer17369696761766459615458464767616256655853485242441Paul Meyer
Walter Johnson17070727166757058605658484869646459686055495245461Walter Johnson
Palo Verde16471696558696656605557534563616258685853484843451Palo Verde
Joe Neal16567697568687256605357484871656161666360484844431Joe Neal
Green Valley15759565164736553565155494263595756636156474943431Green Valley
Jerome Mack15859565779696647515053444269635657636156475344431Jerome Mack
Boulder City15558504859595655545351423868555851596257505546421Boulder City
Jean16656544446505459595757353359525952665754494545481Jean
JD Smith16159606473706950535151454368645657625956455042431JD Smith
Indian Springs15258585447506155434651464351505658665860544342411Indian Springs

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.