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Peak Daily One-Hour Ozone Averages for October 2018

The table below lists the peak daily one-hour ozone concentrations measured in October 2018 in each community where the TREX 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 2018
1234567891011121314
CT-ME-MA-NH-RI-VT
Sipayik TAQP-ME12635222629282729272332282533
AreaMonitoring SitePOCOctober 2018
1234567891011121314
NJ-NY-PR-VI
Saint Regis Mohawk Tribe-NY1NANA132NANANANA31234
AreaMonitoring SitePOCOctober 2018
1234567891011121314
CA-NV-AZ-HI-AS-GU
Cortina Rancheria-CA1 NNANANANANANANANANANANANANANA
Bishop Paiute Tribe Air-CA1 N3525323438333438363775393936
Fort McDowell Yuma Frank-AZ1 N3319364157525346555441333147
Las Vegas Paiute Air Monitoring Site-NV1 N4044344138413740505655414840
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.