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Daily Maximum Eight-Hour Ozone Averages for April 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2017 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 SitePOCApril 2017POCMonitoring Site
Clark County
Paul Meyer14150505352615462545865615760605845446063585665585552645648NA1Paul Meyer
Walter Johnson13948515050595362525763625756595846456062585567615852665749NA1Walter Johnson
Palo Verde14048525048625461515865625556595745455560545565575751655649NA1Palo Verde
Joe Neal13947525240575361515958NV5653595943445861565365585752686049NA1Joe Neal
Green Valley13950465049555359515658575557555742395860555067565551605545NA1Green Valley
Jerome Mack13646434948NVNV55505454535053535440385557534862545048585243NA1Jerome Mack
Boulder City139475049505050605155606055NANANANV435563555167565752625547NA1Boulder City
JD Smith14049455151NV5159515653565456575741NVNV59515164605450615445NA1JD Smith
Indian Springs1NANANA51NVNANV61535859596353565640445359525365565551605445NA1Indian 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.