Air Quality Maps Air Quality Index Ozone Ozone 8-hr Wind Speed Air Temperature Water Quality Hourly Averages By Parameter Daily Summary By Site (Map Select) Daily Summary By Site Monthly Summary By Site (Map Select) Monthly Summary By Site Yearly Summary By Site (Map Select) Yearly Summary By Site Additional Info Air Quality Index Yearly Air Quality Index Summary Current Hourly Averages Current Values Data by Parameter . . . Ozone . . . Ozone Hourly Averages Current Ozone Levels Ozone Summary 8-hr Ozone Attainment Ozone 8-hr 4 Highest Ozone 8-hr Monthly Summary Ozone 8-hr High Value Days Ozone 1-hr High Value Days Peak 1-hr Ozone PM-10 . . . Standard Conditions Local Conditions PM-2.5 . . . Local Conditions Total Atmospheric Local Conditions Raw Data Local Conditions (Acceptable) Meteorology . . . Barometric Pressure Precipitation Relative Humidity Solar Radiation Temperature Wind Direction Wind Gusts Wind Speed Any Parameter Daily Summary by Site (map select) Daily Summary by Site Monthly Summary Report (map select) Monthly Summary Report Yearly Summary Report (map select) Yearly Summary Report Hourly Value Plots Plot Hourly Values By Parameter-All Sites TREX Members The Alabama-Coushatta Tribe of Texas Big Pine Band of Owens Valley Paiute Shoshone Indians of the Big Pine Reservatione Bishop Paiute Tribe Confederated Salish & Kootenai Tribe Confederated Tribes of the Coos - Lower Umpqua - Siuslaw Indians Fort Independence Paiute Tribe Fort McDowell Yavapai Nation Hoopa Valley Tribe Lone Pine Paiute-Shoshone Reservation Passamaquoddy Tribe at Pleasant Point Penobscot Indian Nation Pyramid Lake Paiute Tribe St. Regis Mohawk Tribe The Confederated Tribes of Warm Springs Tribal Air Monitoring Support Center Walker River Paiute Tribe IPS MeteoStar General Information Site Information Site Photos Monitors Site Summary Metro Areas Water Site Information Water Site Photos Water Monitors Contact Us

Compliance with Eight-Hour Ozone Standard

In July 1997, the U. S. Environmental Protection Agency (EPA) announced a new National Ambient Air Quality Standard (NAAQS) for ground-level ozone. The EPA phased out and replaced the previous one-hour standard with an eight-hour standard to protect public health against longer exposure to this air pollutant. In March 2008, the EPA updated the eight-hour standard again. A community will meet the eight-hour standard when the three-year average of the annual fourth highest daily maximum eight-hour ozone concentration measured at each monitoring site is less than or equal to 75 parts per billion (ppb).

Highlighted rows show the monitor in each area that may ultimately be used to determine the area's compliance with the ozone standard. These highlighted monitors have measured an area's ozone concentrations over the past three years.

Below are the annual fourth highest daily maximum eight-hour average ozone concentrations from data collected beginning January 1, 2007, to date. Data is updated each hour. Data is given for each area that has ozone monitors.

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