研究发现，烟雾最浓的三天以及之后的五天暴露于烟雾的人群因心力衰竭症状接受急诊治疗的频次增加了37%。

The study found a 37 percent increase in emergency room visits for people with symptoms of heart failure during a three day period of dense smoke exposure and the following five days.

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全美第三大智库皮尤研究中心称，截至2050年，美国人里“预计最年老的人群增速最快”。

Between now and 2050, population growth "is expected to tilt strongly to the oldest age groups," according to the Pew Research Center.

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