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User Support and Agency Contacts
AQS User Support is provided through the
EPA Call Center, which is operated under contract to the EPA.
The toll free number is 1-866-411-4EPA (4372).
TDD: 1-866-489-4900
International callers: 1-703-679-1070
Their hours of operation are 6:00am - 9:00pm E.T.
(Monday - Friday, excluding Federal holidays). You
may also contact the Call Center via email (EPACALLCENTER@epa.gov)
or fax (703-674-1008).
Central Data Exchange (CDX) is EPA's electronic reporting site. CDX support is available toll-free between the hours of 8:00 am and 6:00 pm (EST) at 888-890-1995 or via email at helpdesk@epacdx.net.
Contact a National or Regional EPA representative or a State, Local, or Tribal Agency representative
http://www.epa.gov/airquality/airdata/ad_contacts.html