Effects on health particularly deadly

The World Health Organization (WHO) conducted an assessment of the role played by various risk factors in disease burden, it became clear that air pollution inside homes is the eighth largest risk factors the most important and is responsible for 2.7% of the global burden of disease. The air pollution inside homes due to the use of solid fuels is responsible for 1.6 million deaths worldwide attributable to pneumonia, chronic respiratory and lung cancer -- the global burden of disease attributable to it (calculated adjusted life years of disability or DALYs, a measure combining years of life lost due to disability and death because of) being five times greater than the load morbidity due to air pollution outside.
In developing countries where mortality is high, the smoke inside the house is responsible for about 3.7% of the global burden of disease, making it the cause of death after the most deadly malnutrition, unprotected sex and lack of safe water and sanitation.