N-VAR 污染物（尤指车辆尾气和工业有毒化学废弃物）Pollutants are substances that pollute the environment, especially gases from vehicles and poisonous chemicals produced as waste by industrial processes. 污染物（尤指车辆尾气和工业有毒化学废弃物）
A steady stream of California traffic clogs the air with pollutants.