![]() They also include airborne viruses such as flu and covid. Microbial aerosols, such as bacteria, fungi and pollen can exist on the surface of dust particles and cause wheezing and allergic rhinitis (cold-like symptoms).This is the source of the persistent odour that smoking or vaping can leave. ![]() The third kind is released as a vapour from surfaces in the home. This includes first, second and third-hand smoke from smoking and vaping. Formaldehyde (or HCHO) in scented candles, plywood and particleboard, tobacco smoke, foam insulation, varnishes and wood finishes can cause asthma.VOCs (volatile organic compounds) in paints, carpets, laminates, cleaning products and air fresheners can cause asthma.Nitrogen dioxide, carbon monoxide and particulates from gas cooking and heating, open fires and wood burners or burning candles, can cause asthma.These are the main culprits and their sources: T he best air purifiers will remove the former, but not the latter, although models with an activated charcoal filter will remove formaldehyde (such as Dyson’s Hepa Cool). There are two types of air pollution: airborne particles and gases. These are mostly chemical sources, but there are also biological sources such as mould.’ 'Other sources are burning candles, using woodstoves and air-freshener use. ‘Some of the major sources of indoor air pollution are cooking and cleaning,' explains Professor Carslaw.
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