Collocations for smog - noun Contents ADJECTIVE … OF SMOG VERB + smog smog + NOUN ADJECTIVE heavy urban photochemical Back to top ▲ … OF SMOG layer a layer of smog over the city Back to top ▲ VERB + smog reduce measures to reduce smog Back to top ▲ smog + NOUN alert level Smog levels are high today. Back to top ▲