A follow-up of the Medicare data analysis expanded the study areas to 968 counties for the years 2000 through 2016 and found a similar pattern of decrease-then-increase in PERs for PM 2.5 and respiratory hospitalizations, but they reported an increasing trend in PER for PM 2.5 and circulatory hospitalizations. 13 The authors speculated that potential impacts of the 2008 recession and changes in PM 2.5 chemical components during the study period could be the cause of these changes in PERs of PM 2.5 over time.
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Changes in respiratory and cardiovascular morbidity air pollution risk and attributable burden in New York City.
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