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Peak Daily One-Hour Ozone Averages for June 2017

The table below lists the peak daily one-hour ozone concentrations measured in June 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 SitePOCJune 2017POCMonitoring Site
12345678910111213141516171819202122
Clark County
Apex1556265626956617161606652667365817855457662751Apex
Mesquite1525554525453566060605752505656565740415858651Mesquite
Paul Meyer1627073616058717260576245567461747551516656751Paul Meyer
Walter Johnson1627478666661727264606547587775818751557862821Walter Johnson
Palo Verde1617377666558707161646146577468798048567362791Palo Verde
Joe Neal1646774647068726962596151648076869047467269841Joe Neal
Green Valley1576472606354656561576647657265737963447262721Green Valley
Jerome Mack1546166555956626451505845627062727439426855701Jerome Mack
Boulder City1575862595948576360595949626661716762446263731Boulder City
Jean1635758605854697152NANA51546167656658526862691Jean
JD Smith1556368606665716558576348667769807846467059731JD Smith
Indian Springs1616669606764707258607349566669595639456460641Indian Springs
Arden Peak4 NNANA66676259697264596751607165727170466970794Arden Peak
NA - Data not available.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

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.