Return to main Clark County MeteoStar Monitoring web page
Return to main Clark County MeteoStar Monitoring web page

Daily Maximum Eight-Hour Ozone Averages for August 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 2019 in each community where the DAQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920
Clark County
Apex155605355585252565453524839516067564944NA1Apex
Mesquite152485050484353524951464439425055565040NA1Mesquite
Paul Meyer159586258575255615151545648595965585443NA1Paul Meyer
Walter Johnson164NV6260595356675152545748596266595642NA1Walter Johnson
Palo Verde159555958575052645050535244545862575137NA1Palo Verde
Joe Neal166596261615759695152535751616370595845NA1Joe Neal
Green Valley157626160615356595354545346636670595347NA1Green Valley
Jerome Mack157595556605253595050515045606566575145NA1Jerome Mack
Boulder City152555455545153575155514942565763595144NA1Boulder City
Jean150535657575354525353555243516163605341NA1Jean
Indian Springs156505461565250524853515749485662565549NA1Indian Springs
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.