The EAQS-6 compact air quality monitoring system adopts modular design. Users can configure the analyzers as per actual needs, such as O3, CO, CO2, H2S, SO2, NO/NO2/NOX, PM2.5, PM10, and meteorological parameters. Design to meet the demands of different application scenarios, such as highly frequent street locations, indoor air quality monitoring, mobile monitoring vehicle, car parking lots, etc, needing no station building or other infrastructures, maximizing cost savings.