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Peak Daily One-Hour Ozone Averages for October 2017

The table below lists the peak daily one-hour ozone concentrations measured in October 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 SitePOCOctober 2017POCMonitoring Site
123456789101112131415161718
Clark County
Apex173466056NANANANANANANANANANANANANANA1Apex
Mesquite1544446531NANANANANANANANANANANANANA1Mesquite
Paul Meyer16547587267464651374749635651524546331Paul Meyer
Walter Johnson17548627370485353404550665756534946341Walter Johnson
Palo Verde17148646866495653415051645754525046361Palo Verde
Joe Neal17047597166475656394955656356505351411Joe Neal
Green Valley16748577466484756384850656147504945351Green Valley
Jerome Mack17148526565474855384750626149494448311Jerome Mack
Boulder City16946556867474648404952656154524750391Boulder City
Jean16049627056534448405153565750545148461Jean
JD Smith17448586665475156374852646150514548311JD Smith
Indian Springs15545576141NANANANANANANANANANANANANA1Indian 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.