According to the WHO, smoke and by-products of indoor fires kill how many people annually?

Name: According to the WHO, smoke and by-products of indoor fires kill how many people annually?
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According to the World Health Organization (WHO), smoke and by-products of indoor fires are responsible for approximately 4 million deaths annually. This is primarily due to the use of solid fuels and traditional cooking and heating methods in poorly ventilated spaces, leading to indoor air pollution.

According to the WHO, Smoke and By-Products of Indoor Fires