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Do candle ligths produce much CO2?

Yes, it does look like it. We measured the CO2 content in a living room, where we placed a CO2 probe (Sensorist). The CO2 content exceeded the recommended limit after we lit the candles.

We lit eight candles in a living room and kitchen. The room is about 35 square metres. The experiment clearly showed that the CO2 content went 50% over the recommended threshold, which is one thousandth (1000 parts per million, ppm). In comparison, a school class might reach a level 300% over the recommendation. The measurement was done with a CO2 probe connected to the Internet (sensorist.com).

After our experiment, the wife in the house bought a set of battery driven tea lights.

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Fig. 1. We lit this candle holder and four more candles.
There were no persons in the room.

 

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Fig. 2. CO2 level rises from about 500 ppm to about 1500 ppm (Sensorist).
The candles burnt for an hour, then the family entered, and we ventilated the room.

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