I can some time smell cigarrette smoke on my condo, and I was wondering if Ruuvi Air can detect the smoke particles or the VOC in the smoke.
Yes, Ruuvi Air can detect changes caused by cigarette smoke, since cigarette smoke contains fine particles and volatile organic compounds, so you may see increases especially in the PM2.5 readings and potentially also in the VOC index. When PM-levels are affected, Indoor Air Quality Score (IAQS) will also decrease when particle levels rise.
However, Ruuvi Air cannot identify the type of smoke specifically. The VOC index is a relative indicator and does not tell which individual compounds are present, and particulate readings can also increase because of other sources such as cooking, candles, dust, or humidifiers. Ruuvi Air is useful for monitoring indoor air quality trends, but it should not be used as a certified smoke detector or as the only device for safety-critical monitoring.