大部分污染被归咎为燃煤电厂和机动车尾气排放。
Most of the pollution is being blamed on coal-fired power plants, together with vehicle emissions.
机动车尾气排放不仅危害人们身体健康，同时也破坏了生态环境。
The automotive exhaust emission will do harm to people's health and destroy the ecological balance.
机动车尾气排放不断增加以及城市通风能力降低，常导致城市街谷内的空气污染。
High pollution levels often occurred in urban street canyon due to the increased traffic emissions and reduced natural ventilation.
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