Newsletter Signup

New EPA SO2 Emissions Data Requirements

Friday, August 21, 2015

On August 10, 2015 The Environmental Protection Agency (EPA) submitted the final rule directing state and tribal air agencies to provide data on air quality in areas with large sources of sulfur dioxide (SO2) emissions under the 2010 1-hour SO2 National Ambient Air Quality Standard (NAAQS).  This rule could impact owners and operators of sources of SO2 emissions, depending on how state, local, and tribal agencies elect to regulate emissions.

There are three key changes:

  1. Agencies must submit a list of sources in their jurisdiction that have SO2 emissions greater than 2,000 tons per year (tpy) during the most recent year for which emissions data for that source are available
  2. There are now 3 options for characterizing air quality:
    • Ambient Monitoring
    • Air Quality Modeling
    • Establishing a federally enforceable limit below 2,000 tpy
  3. Agencies will be required to indicate the option through which they will characterize air quality by July 1, 2016. The option chosen determines submittal and timing requirements for the air agency to provide the required information
    • If ambient monitoring: the monitors must be operational by January 1, 2017.
    • If air quality modeling: the agency must submit a modeling protocol for each source by July 1, 2016 and modeling analyses must by submitted by January 1, 2017
    • If the limit option is chosen: the limit must be adopted and effective by January 13, 2017

For more information,

Information pulled from and The Federal Register


To find out more about this topic, click here.
denotes original PSARA content