§ 50.17. National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
130 words·~1 min read·
/us/cfr/t40/s§ 50.17·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)The level of the national primary 1-hour annual ambient air quality standard for oxides of sulfur is 75 parts per billion (ppb, which is 1 part in 1,000,000,000), measured in the ambient air as sulfur dioxide (SO2).
(b)The 1-hour primary standard is met at an ambient air quality monitoring site when the three-year average of the annual (99th percentile) of the daily maximum 1-hour average concentrations is less than or equal to 75 ppb, as determined in accordance with appendix T of this part.
(c)The level of the standard shall be measured by a reference method based on appendix A or A-1 of this part, or by a Federal Equivalent Method
(FEM)designated in accordance with part 53 of this chapter. [75 FR 35592, June 22, 2010]
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§ 50.17
National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
Fed. Reg.×211
C.F.R.×1
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