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Daily Maximum Eight-Hour Ozone Averages for June 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 2019 in each community where the DAQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCJune 2019POCMonitoring Site
1234567891011121314151617181920212223242526
Clark County
Apex159575659576261415351555760585758536256665143445658511Apex
Mesquite154485360546159435250495054535458555654654640464956541Mesquite
Paul Meyer162616568696862465468646262656565667266705947586365661Paul Meyer
Walter Johnson162636464676860445265686161616566666865686046576364671Walter Johnson
Palo Verde15857585759NANV414558605355495559585758625343505759601Palo Verde
Joe Neal162646261656659435062656358576263626466675644536365671Joe Neal
Green Valley163586370726764525462646661686464637163705846566164601Green Valley
Jerome Mack1595658NVNV6460475359636058636261616961675843535862601Jerome Mack
Boulder City160585863626258455757575962676061596255705645485758531Boulder City
Jean160556564615653505459525460635560576259625549506164621Jean
Indian Springs163565557516655454850495460525559565860654943486265661Indian Springs
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.