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Peak Daily One-Hour Ozone Averages for March 2019

The table below lists the peak daily one-hour ozone concentrations measured in March 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 SitePOCMarch 2019POCMonitoring Site
1234567891011121314151617181920212223
Clark County
Apex1NANANANANANANANANANANANANANANANANANANA495254551Apex
Mesquite1NANANANANANANANANANANANANANANANANANANA465351511Mesquite
Paul Meyer146444618474251465051494950465053545752475455541Paul Meyer
Walter Johnson144404445434050464950484951454952535650475255511Walter Johnson
Palo Verde142384141434146434647444851434448525447414650491Palo Verde
Joe Neal140354544443646414747463546404648485147404447471Joe Neal
Green Valley14741444514NA42404242413250454751525352505455551Green Valley
Jerome Mack146394448473949455051484951464952525549495355541Jerome Mack
Boulder City146434544483948455148474750455051515050485452531Boulder City
Jean144NANANA444151485050484149474954555654495553581Jean
Indian Springs1NANANANANANANANANANANANANANANANANANANANA4752531Indian 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.