Sulfur Dioxide (SO2) Primary Standards - Integrated Science Assessments from Current Review

The integrated science assessment (ISA) in conjunction with additional technical and policy assessments provides the scientific basis for EPA decisions in the review.

• ISA for Sulfur Oxides - Health Criteria (Final) - December 2017
• ISA for Sulfur Oxides - Health Criteria (Second External Review Draft) - December 2016
• ISA for Sulfur Oxides - Health Criteria (First External Review Draft) - November 2015

You may also be interested in other documents from the current sulfur dioxide primary NAAQS review.