This important new study conducted a systematic review of wildfire smoke from all over the world and the association between PM from smoke and presentations to emergency departments for asthma and admissions to hospital for asthma.
The main results were that:
1) Associations were present in all age-groups but increased with age. The group with the greatest size of the association was people over 65 years. For ED presentations it was also possible to evaluate results by sex and there were much clearer associations between fire smoke and asthma presentations for females than there were for males.
(2) The overall size of the associations between smoke-specific PM and asthma presentations and admissions were around 5 times higher than what is generally found in studies of background air pollution from multiple sources, eg in urban environments, and these outcomes.