The Opsis system is designated equivalent to 40 CFR.
Opsis UV DOAS AQM system for benzene,
ammonia and nitric oxide is U.S. ETV EPA tested.
Opsis SM200 particulate
monitor is a designated method for PM2.5 and PM10.
U.S. EPA List of Designated Methods
The notification for PM2,5 in the Federal Register >>
U.S. EPA website >>
U.S. ETV EPA website >>