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Peak Daily One-Hour Ozone Averages for June 2019

The table below lists the peak daily one-hour ozone concentrations measured in June 2019 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 2019POCMonitoring Site
12345678910111213141516171819202122232425
Clark County
Apex1635958626266645257536263626464615667597060464758631Apex
Mesquite1625154645763615657545153585455605859586758414852591Mesquite
Paul Meyer1656570727569655058746972637470697077717467506267691Paul Meyer
Walter Johnson1656768667371634757707466636671727075777271496267681Walter Johnson
Palo Verde1616163596551565151626460575360656463696663475461621Palo Verde
Joe Neal1656965647068625156667170626269696571787166465866691Joe Neal
Green Valley1666066758169675658687069657266666878667465476363701Green Valley
Jerome Mack1625762427666625357667265607263646575657070455961681Jerome Mack
Boulder City1626161657064654860626062667263636066567563465061641Boulder City
Jean1625872696462635458625557656658626166637357525165691Jean
Indian Springs1696257605368574951525059645558645862616956445471701Indian 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.