Also discussed here: High-pollution days linked to increased risk of cardiac arrest (ScienceDaily, Oct. 7, 2014)
Today we review research into the risk of heart attacks after several days of high levels of air pollution. Results indicate a greater risk of between 17 and 40% after exposure to particulate matter or ozone respectively.
“cardiac arrest rates were higher a few days after increased levels of several air pollutants. For example, 48 to 72 hours after days with high levels of particulate air pollution, the risk of out-of-hospital cardiac arrest increased by 17 percent…There was a 40 percent increase in risk 72 to 96 hours after days with higher ozone levels”
"The evidence presented provides further support for the hypothesis that exposure to outdoor air pollution increases the risk of cardiac arrest,"
“ particulate matter and ozone may induce cardiac arrest via "two distinct pathways." Exposure to particulate pollution may result in myocardial infarction, while ozone may worsen other cardiac conditions, increasing the risk of cardiac arrest.”