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Daily Maximum Eight-Hour Ozone Averages for October 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in October 2018 in each community where the TREX 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 SitePOCOctober 2018
123456789101112131415
CT-ME-MA-NH-RI-VT
Sipayik TAQP-ME1223121NV2726222723203018213139
AreaMonitoring SitePOCOctober 2018
123456789101112131415
NJ-NY-PR-VI
Saint Regis Mohawk Tribe-NY1NANANV2NVNANANANA1NV2331
AreaMonitoring SitePOCOctober 2018
123456789101112131415
CA-NV-AZ-HI-AS-GU
Cortina Rancheria-CA1 N0000000000000NVNA
Bishop Paiute Tribe Air-CA1 N321827292930323530332532323429
Fort McDowell Yuma Frank-AZ1 N301830354646494148493831264039
Las Vegas Paiute Air Monitoring Site-NV1 N323632393638343744514838423942
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.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

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 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
301 - 400 0.405 - 0.504 Not Defined
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

PLEASE NOTE: This data has not been verified by the TREX 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 TREX 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.