Sulfur Dioxide Air Quality Standard

Today the USEPA published its revised primary ambient air quality rule (75 FR 35520) for sulfur dioxide.  A new 1-hour standard was set at a level of 75 parts per billion, based on the 3-year average of the 99th percentile of 1-hour daily maximum concentrations.  The previously existing 24-hour and annual primary standards were revoked. 

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