1、Air pollution is a serious problem caused by various pollutants released into the atmosphere.
空气污染是由释放到大气中的各种污染物引起的严重问题。
2、Chemical waste is a major source of water pollutants, which can have detrimental effects on aquatic ecosystems.
化学废物是水污染物的主要来源，对水生态系统产生不良影响。