Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

JavaScript appears to be disabled on this computer. Please click here to see any active alerts.

Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard - Round 3 - July 2016

This memorandum provides information on the schedule and process for the area designations for the 2010 primary sulfur dioxide standard that were completed on December 21, 2017.

Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard - Round 3 (pdf) (1.26 MB)

Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard - Round 3 - July 2016

Sulfur Dioxide Designations