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Peak Daily One-Hour Ozone Averages for March 2017

The table below lists the peak daily one-hour ozone concentrations measured in March 2017 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 SitePOCMarch 2017POCMonitoring Site
123456789101112131415161718192021222324252627
Clark County
Paul Meyer146484857594842454346495447584941NANANANA405549495654541Paul Meyer
Walter Johnson14246455557454242434746484554445556565345415354505756551Walter Johnson
Palo Verde14548475759464347444646504856475959575547465553545657561Palo Verde
Joe Neal14550486159474848465146505260546260595747415353525758561Joe Neal
Green Valley14448455256474444414442524454505656515047405147495450461Green Valley
Jerome Mack14448485455464644414543494354505554494746384846465148461Jerome Mack
Boulder City14348465256474143434741464248494853524945435148535849521Boulder City
Jean14447475457484744444749474755454550514944405248525353551Jean
JD Smith14548495557474948464845514658535857545248405051495555511JD Smith
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.