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Peak Daily One-Hour Ozone Averages for October 2020

The table below lists the peak daily one-hour ozone concentrations measured in October 2020 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 SitePOCOctober 2020POCMonitoring Site
123456789101112131415161718192021
Clark County
Apex132NANANANANANANANANANANANANANANANANANANANA1Apex
Mesquite133NANANANANANANANANANANANANANANANANANANANA1Mesquite
Paul Meyer15462676761626358606251626358524843484043451Paul Meyer
Mountains Edge15560646362596257626551566053535043493943471Mountains Edge
Walter Johnson14959637265636460596752686159524846534349481Walter Johnson
Palo Verde14152566357565756555942615748484241483543391Palo Verde
Joe Neal14656627162606359617445626463524857564949491Joe Neal
Green Valley14660615956605653606451565259484844494146471Green Valley
Jerome Mack14350555855555451576448565258454646463844461Jerome Mack
Boulder City14855565754555651616752515562475041464445491Boulder City
Jean15554585355585859615946485343555240383744491Jean
Indian Springs139434450NANANANANANANANANANANANANANANANANA1Indian 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.