emission noun
ADJ. harmful, noxious, toxic | gaseous | exhaust, vehicle | industrial | atmospheric | acid, carbon, carbon dioxide, lead, sulphur, sulphur dioxide, etc.
VERB + EMISSION cut, reduce We must take action to cut vehicle emissions. | control, limit, stabilize
EMISSION + VERB increase | decrease, fall
EMISSION + NOUN levels
PREP. ~s from measures to reduce harmful emissions from traffic
You can also check other dicts: emission (English, 中文解释 ), wordnet sense, Collins Definition