... widely 2. efficient and effective. TH-2000 Ambient Air Quality Automatic Monitoring System is consist of a central ... SO2, NOx, PM10, PM2.5, CO, O3(optional)Meteorological instrument: measuring wind speed, wind direction, relative humidity, atmospheric pressure, ... exhaust port Field calibration system: standard gas generator, zero air generator, dynamic gas generator Basic configuration: TH-2007 Zero ...