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The researchers analysed the particulate matter concentration found in the air of a small chapel and a large basilica in Maastricht following lengthy use of candles or a simulated service in which incense was burned.
Fine particulate matter is a major ingredient in air pollution. Consisting of solid particles with a diameter of 10 microns or less, it contains different types of toxic chemicals, including soot, metals and various carcinogenic molecules.
The particles can penetrate very deep into the lungs and trigger various lung and heart conditions.