Option A: 'Hazards' means 'put in danger'.
Option B: 'Changes' means 'alter' or 'make different from the original'.
Option C: 'Worsens' means 'to make or become worse'.
Option D: 'Pollutes' means 'contaminates with harmful or poisonous substances'.
From these words, 'pollutes' is the most suitable word as it completes the sentence in meaning: the smoke that is released from the industries contaminates the atmosphere, it degrades the quality of air with harmful particles and gases.
Hence option D is correct.
The other words 'hazards', 'changes' and 'worsens' do not complete the sentence, in comparison to 'pollutes'. Hence these options A, B, C are incorrect.