00:00Many people assume that air pollution is mainly an outdoor problem but researchers in Birmingham have found high levels of pollution inside ordinary homes.
00:12Scientists placed pollution monitors in three suburban houses to track tiny airborne particles usually linked to traffic emissions.
00:21The results showed that in some cases indoor air was more polluted than the air outside, with one home exceeding World Health Organization safety guidelines on nine separate days.
00:32Experts say pollution sources include dust, cooking and scented candles.
00:38One home recorded lower pollution levels overall, where occupants regularly used extractor fans while cooking and opened windows during the day.
00:47Researchers have also explored the impact of this pollution on brain function, finding that it can affect concentration and the ability to carry out tasks.
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