                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            WASHINGTON, D.C. 20460



                               February 16, 2021


	OFFICE OF
                                                              AIR AND RADIATION

George (Tad) S. Aburn, Jr.
Director, Air and Radiation Administration
Maryland Department of the Environment
1800 Washington Boulevard
Baltimore, MD 21230


Dear Mr. Aburn:

      Thank you for your letter dated January 28, 2021 in which you request that the U.S. Environmental Protection Agency (EPA) extend the comment period for the above EPA notice by 30 days.

      The Agency will grant the request for the extension and will publish a notice in the Federal Register announcing the extension. EPA is extending the comment period for the following reasons: (1) the legal and technical complexity of the analysis of the recommendation; (2) the need for stakeholders to consider the interaction of this decision with other actions the Agency is concurrently considering; (3) the stakeholders' need for additional time to review and develop constructive comments and related analyses on the recommendation.

      Again, thank you for your letter.  I appreciate the opportunity to be of service and trust the information provided is helpful.

                              Sincerely,
                              



                              Christopher Grundler
 						Director, Office of Atmospheric Programs

 
