Data and Tools

2016 Revisions to the Exceptional Events Rule: Update to Frequently Asked Questions

This September 11, 2018, document replaces the “Interim Exceptional Events Rule Frequently Asked Questions” document posted on May 14, 2013.

Exceptional Events Submissions Table (2016 Rule)

This table contains examples of air agency submitted exceptional events demonstrations and responsive EPA decision documents that have been prepared and/or acted upon under the 2016 Exceptional Events Rule

Exceptional Events Documents Ozone - Pennsylvania

Exceptional Events Documents Ozone - Rhode Island

WATERS (Watershed Assessment, Tracking & Environmental Results System)

A system that unites water quality information from several independent and unconnected databases.

Exceptional Events Documents Ozone - Massachusetts

Webinar Presentation - Final Exceptional Events Rule Revisions and Final Wildfire/Ozone Implementation Guidance

Slides for 9/21/2016 webinar titled Final Exceptional Events Rule Revisions and Final Wildfire/Ozone Implementation Guidance

Particulate Matter NAAQS Review - Analyses and Data Sets

Analyses and data sets for the Particulate Matter NAAQS review

Carbon Monoxide NAAQS Review - Analyses and Data Sets

Analyses and data sets for CO NAAQS Review

Nitrogen Dioxide NAAQS Review - Analyses and Data Sets

Analyses and data sets for the NO2 NAAQS review

Lead NAAQS Review - Analyses and Data Sets

Analyses and data sets for the Lead NAAQS review

Sulfur Dioxide NAAQS Review - Analyses and Data Sets

Analyses and data sets for Sulfur Dioxide NAAQS review

Trends in Ozone Adjusted for Weather Conditions

Describes met-adjustments to ambient ozone trends.

Ozone Trends

National and regional trends in ambient ozone concentrations.

Lead Trends

National and regional trends in lead concentrations.

Nitrogen Dioxide Trends

National and regional trends in ambient NO2.

Particulate Matter (PM10) Trends

National and regional trends in ambient PM10 and PM2.5 concentrations.

Particulate Matter (PM2.5) Trends

National and regional trends in ambient PM10 and PM2.5 concentrations.

Sulfur Dioxide Trends

National and regional trends in ambient SO2 concentrations.

Carbon Monoxide Trends

National and regional trends in carbon monoxide.