According to WHO (World Health Organization) and World Bank experts, indoor air pollution is

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According to WHO and World Bank experts, indoor air pollution is the world's most serious air pollution problem. This is particularly true for poor countries where solid fuels like wood, charcoal, and coal are commonly used for cooking and heating, leading to high levels of indoor air pollution. However, indoor air pollution is also a problem in affluent countries due to factors like poorly ventilated buildings and indoor use of chemicals and household products.

According to WHO (World Health Organization) and World Bank Experts