air pollutionsource

例句：

1. 1. The city's air pollution has become a major concern for the public.
   城市的空气污染已成为公众关注的重大问题。
2. 2. The government is working hard to reduce air pollution sources in the city.
   政府正努力减少城市中的空气污染源。
3. 3. The study found that air pollution sources are mainly from industrial emissions and vehicle exhausts.
   研究发现，空气污染源主要来自工业排放和车辆尾气。