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Peak Daily One-Hour Ozone Averages for April 2019

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2019POCMonitoring Site
12345678910111213141516171819
Clark County
Apex1536057525251565163515145516563515043511Apex
Mesquite1495849504846475459514947506463604945461Mesquite
Paul Meyer1546055555055636163545255626763515552561Paul Meyer
Walter Johnson1536056544653655863535254606661505451551Walter Johnson
Palo Verde1485448514448605560514548566357445550541Palo Verde
Joe Neal1515547494749595558544647NANA59495249571Joe Neal
Green Valley1586356535155635863505454626865535347561Green Valley
Jerome Mack1566357525157NA4935NA5154616762545448571Jerome Mack
Boulder City1515959504957515464525553536764525146521Boulder City
Jean1576551554953515263535150577165515654531Jean
Indian Springs1545748535149515757515153576556504840591Indian 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.