There is an increased risk of out-of-hospital cardiac arrest even from short-term exposure to low concentrations of dangerously small particulate matter PM2.5, an international study has found, noting an association with gaseous pollutants such as those from coal burning, wildfires/bushfires and motor vehicles. The authors call for a tightening of standards worldwide; the findings also point to the need to transition to cleaner energy.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/01/200128115421.htm
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