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Peak Daily One-Hour Ozone Averages for October 2021

The table below lists the peak daily one-hour ozone concentrations measured in October 2021 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 SitePOCOctober 2021POCMonitoring Site
1234567891011121314151617
Clark County
Virgin Valley155595653434445405145554243454548531Virgin Valley
Paul Meyer162646154465552424851553942454450531Paul Meyer
Mountains Edge156555248404946394548503742444449541Mountains Edge
Walter Johnson160646056475451424848574143444650561Walter Johnson
Palo Verde160646156485553414948553841424349551Palo Verde
Joe Neal160625958485753414848554046454450551Joe Neal
Green Valley158625856455350435049534041444447531Green Valley
Liberty High School158595652435146404648503740424347511Liberty High School
Jerome Mack155595353435050384747523938434346481Jerome Mack
Garrett Junior High158595656454956465245554245444548531Garrett Junior High
Jean16359575637NANA454950564045464652571Jean
Walnut157605558465150414847523844414146491Walnut
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.