AQS Web Application
Welcome to the Environmental Protection Agency (EPA) Air Quality System (AQS). AQS has been migrated and deployed on the Web to eliminate the installation and updates of the AQS software on users' machines and to eliminate the need for the SecuRemote software.
AQS is exclusively for the use of Federal, State, Territorial, and Tribal environmental agency employees and their delegatees working in their official capacities.
First Time Users: You must be registered with AQS prior to using it. Please refer to the User Registration link on the sidebar for the form used to register. In addition, there is a one-time initial setup needed to access the AQS Web application. Click the following link for AQS Web Application Setup. You may also find this AQS User Guide (PDF) (113 pp, 4148K, About PDF) helpful.
AQS Web Change Log: Description of modifications made to the AQS Web application
Use the following Links to Access AQS or ENSC application directly. You can also access ENSC while you are in AQS. NOTE: At this stage, access using each application directly will require you to login each time.
Proceed to AQS or Proceed to ENSC
If you need assistance accessing any of the material in AQS, User Support is provided through the EPA Call Center. The toll free number is 866-411-4EPA (866-411-4372). Please contact them first with any questions about using the AQS application.