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Brick kiln operations induced air pollution is one of the severe problems worlds facing today, especially for developing countries like Bangladesh. Brick industries are growing rapidly in Bangladesh, India, and Nepal where more than 108,000 brick kilns are in operation and, thus, air pollution increases along with it; resulting in degradation of ecological condition, acute and chronic effects on human health and also property damages. It is most dangerous among all type of pollutions because man need fresh air for their normal metabolic pathways. Most of the brick kilns are poorly designed, which cause incomplete combustion of coals mostly used fuel for brick production. Incomplete combustion of this coal, sometimes rubber tires, produces carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), ozone (O3), hydrocarbons (HC), particulate matter (PM), fluoride compounds, and small amount of carcinogenic dioxins. Exposure to these air pollutants can overload or break down natural defense mechanisms in the body, causing or contributing to respiratory diseases such as lung cancer, asthma, chronic bronchitis, and emphysema, which at high enough concentrations can even be fatal.

Health effects of brick kiln operations: A study on largest brick kiln cluster in Bangladesh