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Daily Maximum Eight-Hour Ozone Averages for September 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 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 SitePOCSeptember 2017POCMonitoring Site
12345678910111213141516171819202122232425
Clark County
Apex1555953535959564952515039376360555358555748NVNV41NA1Apex
Mesquite1495247444748494446434330324646484652545146NVNV36NA1Mesquite
Paul Meyer1646360615162555158525437406054585260515145NVNV42NA1Paul Meyer
Walter Johnson1636362645463595356535439426156585462525147NVNV44NA1Walter Johnson
Palo Verde1576362565062565155NVNV38375654565463515046NVNV42NA1Palo Verde
Joe Neal1596264635758595255NVNV42426358565661555346NVNV42NA1Joe Neal
Green Valley1535653485260524653505040375955534958545246NVNV41NA1Green Valley
Jerome Mack1555751535458524448484739376158545057525245NVNV42NA1Jerome Mack
Boulder City1535648465254555152514938356352544756555448NVNV40NA1Boulder City
Jean162545041424751515254493137NV49574959525246NVNV45NA1Jean
JD Smith1555656555457554450494839366057545156505142NVNV41NA1JD Smith
Indian Springs1505652474246554941NVNV38364946525459545248NVNV38NA1Indian 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.