ADS-SMOKE is an indoor air quality sensor with analog voltage output 0 – 10 V and an output relay with adjustable switching level. The sensor has a high sensitivity to low concentrations of pollutant gasses in the air. For example carbon monoxide and hydrogen, those are contained in the cigarette smoke. Therefore is the ADS-SMOKE appropriate for use in areas polluted by cigarette smoke. Monitoring of the air pollution allows very economical controlling of ventilation systems. The sensor is also suitable for tentative detection of alcohol vapors, methane/propane-butane/natural gas leak.