AQS Memos - Monitoring and Policy

In the table below, you find information concerning monitoring and policy

Memo Date	Memo Name/Contents
05-13-2024	Federal Register Notice: Update of PM2.5 data from T640/T640X PM Mass Monitors (5/16/24) Supplemental Information on the EPA's Update of PM2.5 Data from T640/T640X PM Mass Monitors (pdf) (307.22 KB) Summary of and Responses to Public Comments on the EPA's Plan to Update PM2.5 data from T640/T640X PM Mass Monitors (pdf) (207.15 KB) Quick Reference Guide to T640/T640X Data (pdf) (147.63 KB) Development of an FRM alignment factor for the Teledyne API T640 and T640x particulate matter monitors
01-19-16	Updates to Census Population Data in AQS
12-22-14	Changes to Oxides of Nitrogen Analyzer method codes
07-24-08	Implementing continuous PM2.5 Federal equivalent methods(FEMs) and approved regional methods (ARMs) in State or Local Air Monitoring Station (SLAMS) Network

Additional monitoring information can be found at the Ambient Monitoring Technology Information Center website.

Air Quality System (AQS)