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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
123456789101112131415161718192021
Clark County
Apex15562656269566171616066526673658178554576621Apex
Mesquite15255545254535660606057525056565657404158581Mesquite
Paul Meyer16270736160587172605762455674617475515166561Paul Meyer
Walter Johnson16274786666617272646065475877758187515578621Walter Johnson
Palo Verde16173776665587071616461465774687980485673621Palo Verde
Joe Neal16467746470687269625961516480768690474672691Joe Neal
Green Valley15764726063546565615766476572657379634472621Green Valley
Jerome Mack15461665559566264515058456270627274394268551Jerome Mack
Boulder City15758625959485763605959496266617167624462631Boulder City
Jean1635758605854697152NANA515461676566585268621Jean
JD Smith15563686066657165585763486677698078464670591JD Smith
Indian Springs16166696067647072586073495666695956394564601Indian Springs
Arden Peak4 NNANA666762596972645967516071657271704669704Arden 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.