The elderly aged 65 years had a shorter lag time to develop asthma exacerbation following exposure to pollutants than those aged 65 years 至于哮喘恶化的速度， 65岁或以上的长者比起65岁以下的人士明显较快。
2.
Walk on the windward side of the street where exposure to pollutants can be 50 pcercent less than on the downside 即使只是远离主要污染源?尾气多几米远，空气污染程度都会大大下降。同时，不要走在吸烟人的后面。
