Royal College of Physicians and Royal College of Paediatric and Child Health, London February 2016 (download pdf of study)
While many studies have looked at the impact of outdoor air pollution, this study highlights the impact of indoor air pollution with sources of indoor pollution including smoking, faulty boilers, gas cookers and heaters, as well as irritants from new furniture, air fresheners and household cleaning products.
A study by the US Environmental Protection Agency
found that the air inside the typical home is on average 2-5 times more polluted than the air just outside and in extreme cases 100 times more contaminated largely because of household cleaners and pesticides.
A study by Stony Brook University, New York, December 2015,
suggests that environmental behaviour (including exposure to cleaning products) contributes to some 80% of cancers.