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Standards for Criteria Pollutants

  • (See endnotes 2, 3)
  • Carbon monoxide—The primary standard is 9 ppm for an 8-hour period or 35 ppm for 1 hour, not to be exceeded more than once per year. (The final rule was published on August 31, 2011.)
  • Lead—On a rolling 3-month average, the primary and secondary standard of 0.15 pg/m3 of air must not be exceeded. (The final rule was published on November 12, 2008.)
  • Nitrogen dioxide—Averaged over a 3-year period, the primary standard must not exceed 100 ppb in a 1-hour period. The annual mean of the readings should not exceed 53 ppb for the primary and secondary standards. (The final rule was published on February 9, 2010.)
  • Ozone—The 8-hour maximum concentration averaged over a 3-year period should not exceed 0.075 ppm for both the primary and secondary standards. (The final rule was published on March 27, 2008.)
  • Respirable particulate matter (PMI0)—Measured over a 24-hour period, the primary and secondary standards must not exceed 150 pg/m3 of air more than once per year on an average over a 3-year period. (The final rule was published on January 15, 2013.)
  • Fine particulate matter (PM2 5)—Measured as an annual mean and averaged over a 3-year period, the annual primary standard is 12 pg/m3 of air, while the secondary standard using the same parameters is 15 pg/m3 of air. The 24-hour standard is 35 pg/m3 of air. (The final rule was published on January 15, 2013.)
  • Sulfur dioxide—Measured as 1-hour daily maximum concentrations averaged over 3 years, the primary standard is 75 ppb, while the secondary standard using a 3-hour averaging time and not to be exceeded more than once per year is 0.5 ppm. (The final rule was published on June 22, 2010.)
 
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