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Daily Maximum Eight-Hour Ozone Averages for June 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 2018 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 SitePOCJune 2018POCMonitoring Site
1234567891011121314151617181920
Clark County
Apex160566064505964686858605152624640646969421Apex
Mesquite159535357505250546551494444514238405555351Mesquite
Paul Meyer169595965595964716558635756584648646672441Paul Meyer
Walter Johnson169576167605965746659655756594848656972461Walter Johnson
Palo Verde163525662545462686053615453554346616266451Palo Verde
Joe Neal165536264585762716252635556564145626866461Joe Neal
Green Valley167606266576366707165615457624545656777401Green Valley
Jerome Mack165596465546263706963605356614444626775371Jerome Mack
Boulder City166595960485663666960554551574242536169481Boulder City
Jean172635967616169716855615559604646666569511Jean
Indian Springs155545564625768736452NV5958604951646056401Indian 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).

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.