空气污染与老年人就医有关

expose – v. to leave (something) without covering or protection

soot – v. a black powder that is formed when something, such as wood or coal, is burned

data – n. facts or information used usually to calculate, analyze, or plan something

zip code – n. a group of numbers that is used in the U.S. as part of an address to identify a mail delivery area

cubic – adj. a measurement that is produced by multiplying something's length by its width and height