Abstract

Pollutants in the air are often thought to originate from human activities, such as smoke from factories or exhaust from vehicles. The problem, though, is that there are just as many types of indoor air pollution. Indoor air quality can deteriorate if kerosene, wood, or coal are used as heating sources. Ashes and smoke can stick to surfaces and cause irritation to the respiratory system as well as other problems, such as making it difficult to eat or wear clean clothes.