Responses to Significant Comments on the 2020 Proposed Decision on the National Ambient Air Quality Standards for Particulate Matter

Documents posted here, together with their associated  final decision notices present the responses of the EPA to significant public comments received on the proposed decisions.

• Responses to Significant Comments on the 2023 Proposed Rule for the Reconsideration of the National Ambient Air Quality Standards for Particulate Matter (pdf) (1.08 MB, 2024)
• Responses to Significant Comments on the 2020 Proposed Decision on the National Ambient Air Quality Standards for Particulate Matter (pdf) (415.1 KB, December 2020)