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Peak Daily One-Hour Ozone Averages for July 2017

The table below lists the peak daily one-hour ozone concentrations measured in July 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 SitePOCJuly 2017POCMonitoring Site
123456789101112131415161718192021
Clark County
Apex16465647363646567626585716469755752545362591Apex
Mesquite15865576152575854585566595956565352454549481Mesquite
Paul Meyer17164688059698073656685787774816050625058651Paul Meyer
Walter Johnson18167698667749381677081788080826853635058631Walter Johnson
Palo Verde18169698367768677686675817978816653635258641Palo Verde
Joe Neal17466789170768686667670778281846958685561771Joe Neal
Green Valley1636670756170698161598773687073555158NA58651Green Valley
Jerome Mack15860647253606873535676646664684845584757711Jerome Mack
Boulder City16165686854556462635972685961665152514955551Boulder City
Jean16267736954575863596172586661636349584859681Jean
JD Smith16764688561698179616585707172745745624758711JD Smith
Indian Springs174697568555960616263626349NANANANANANANANA1Indian 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.