symptom-free days and improvement in asthma symptoms . HEPA filters were also found to improve symptoms in patients with allergic rhinitis . HEPA filtration was also found to be effective in lowering indoor particulate matter resulting from wildfire emissions . Modelling studies estimated that portable air cleaner use during wildfires in California in the USA provided mortality-related cost-effective benefits, which would be improved further by targeting the elderly . Another modelling study came to similar conclusions for using activated carbon filters in homes to reduce indoor
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