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Peak Daily One-Hour Ozone Averages for May 2019

The table below lists the peak daily one-hour ozone concentrations measured in May 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 SitePOCMay 2019POCMonitoring Site
123456789101112131415161718192021222324
Clark County
Apex15053596163475549444544526260575851595152575144511Apex
Mesquite15253556057454946464346525355545552536250565347421Mesquite
Paul Meyer16165687067515352495255646562625953665453595447511Paul Meyer
Walter Johnson15864667170515351494952626661606051655354595347491Walter Johnson
Palo Verde15359596359464547444545605946565645594948544842431Palo Verde
Joe Neal154646670715254534939NANA6659595951595153585448411Joe Neal
Green Valley16064636569515358485457586265606156665654615346541Green Valley
Jerome Mack15663636468495257465155576363585653625252585147531Jerome Mack
Boulder City15457616463495251474950585959576257635553595347461Boulder City
Jean15862636865515352495561626463626152675656595248471Jean
Indian Springs14959656972555146504152516461586049635254585146371Indian 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.