Ambient air quality monitoring networks are designed and operated by tribal, state, or local governments to determine if the Clean Air Act requirements are being met and maintained. Networks monitor  “criteria” air pollutants (ozone, particulate matter (coarse, PM10 and PM2.5), lead, carbon monoxide, nitrogen dioxide, and sulfur dioxide) as well as atmospheric information, visibility characteristics, photochemical reactivity, and  air toxic pollutants. MARAMA primarily assists member state monitoring groups by offering training and coordination services, including holding an annual Monitoring Workshop.