The Met One BAM 1020 automatically measures and records airborne particulate concentration levels (in milligrams or micrograms per cubic meter) using beta ray attenuation. The 1020 Beta Attenuator Mass monitor is designed for U.S. EPA Federal Equivalent Method (FEM) continuous PM_2.5 or PM₁₀ monitoring (and meets European equivalent standards). Integrated data logger allows connection of up to two multi-parameter meteorological sensors, with data transfer via Ethernet, USB, RS-232 serial port using Met One’s Air Plus or, with modem option, using Comet Cloud software.