What are three reasons why indoor air pollution has become a greater concern in developed countries

Following are the three main reasons why indoor air pollution has become a greater concern in developed countries;

Indoor air pollution is the cause for several diseases in children and in adults. For example pulmonary disease, lung diseases, tuberculosis and etc. Indoor air pollution is also increasing due to the use of older technologies being used in the households for example smoke from chimneys and old stoves that have worn out. There is not enough budget and awareness of indoor air pollution and neither are efficient solutions provided to cater to this pressing issue.