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Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In general, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter and to control cell highlighting based on measured Ozone levels. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
Select a date: Time Format: Select a Parameter:
   
Ozone Highlights:  Moderate   Unhealthy for Sensitives   Unhealthy   Very Unhealthy  
Highlight validated data (Validated data has been manually reviewed by a data validator)
Select a Region:

Ozone Hourly Averages for Sunday, April 30, 2017.
measured in parts per billion
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00
CT-ME-MA-NH-RI-VT - all times are in EST
32  1 373736353535373737373738404140343432 32  1 1 R Oth Gov
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00
NJ-NY-PR-VI - all times are in EST
1035  2 333333333333333333 1035  2 1 R Oth Gov
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00
KY-TN-NC-SC-MS-AL-GA-FL - all times are in EST
5  3 PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM 5  3 1 N Oth Gov
RegionCAMSMorningAfternoonCAMSPOCEntity
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00
CA-NV-AZ-HI-AS-GU - refer to the first data column for each site's specific time zone
PST1007  4 000000000000000000 1007  4 1 N Oth Gov
PST1023  5 78671213579131823273237404037 1023  5 1 N Oth Gov
MST1030  6 262320172017202640424648505459646663 1030  6 1 N Oth Gov
PST8000  7 LIM SPZ SPZ LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM 8000  7 1 N Oth Gov
Notes:
- These sites are maintained and operated by Passamaquoddy Tribe at Pleasant Point.
- These sites are maintained and operated by St. Regis Mohawk Tribe.
- These sites are maintained and operated by Eastern Band of Cherokee Indians.
- These sites are maintained and operated by Cortina Rancheria Band of Wintun Indians of California.
- These sites are maintained and operated by Bishop Paiute Tribe EMO-Air.
- These sites are maintained and operated by Fort McDowell Yavapai Nation.
- These sites are maintained and operated by Las Vegas Paiute Tribe.

TREX does not certify the validity or quality of data it hosts from other monitoring entities.
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

Key to Ozone Highlight Colors:

Hourly ozone levels have been mapped to a set of surrogate values based on custom 1-hour breakpoints.
The table below shows the levels, color-coding, and suggested actions for the 1-hour surrogate.

Ozone levels in this range are projected to be moderate based on the one-hour surrogate calculation for Ozone.
  • Unusually sensitive individuals may experience respiratory symptoms.
  • Unusually sensitive individuals may experience respiratory symptoms.

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.