There are many sources or processes that emit VOCs, especially in urban areas and areas of industrial activity, for example by burning or combustion of crude oils, fuels, natural gas, wood or coal, but ordinary products for domestic use or other elements employed in the workplace also emit VOCs, such as resins, paints, solvents, lacquers, carpets and rugs, plastics, rubbers, varnishes, air fresheners, several sprays, cleaning and disinfecting products, personal hygiene products and cosmetics, tobacco smoke, etc.

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