How people influence the indoor air quality?

People are one of the strongest sources of pollution to indoor air. They influence indoor air quality in two general ways: continuously and discontinuously. The continuous impact is due to their decisions about the building construction materials and elements, interior and furniture materials, heating and ventilation systems, etc. The discontinuous impact is due to their presence in a space. Then they deteriorate the indoor air quality by their physiology (respiration, bio-effluents, desquamation, etc.), activities (cooking, cleaning, sport, etc.), and habits (hobbies, smoking, aromatizing, etc.).