A dense mass of water drops on smoke or dust particles in the lower atmosphere layers is referred to as:

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### Step-by-step explanation

- (1) **Mist**: consists of tiny water droplets suspended near the ground, but the term doesn't specifically imply association with smoke or dust particles.
- (2) **Blizzard**: a severe snowstorm with strong winds and blowing snow — not related to suspended water droplets on particles.
- (3) **Frost**: formation of ice crystals on surfaces when temperature falls below freezing — not a mass of suspended water droplets.
- (4) **Smog**: a portmanteau of "smoke" and "fog"; it describes a dense mixture where water droplets (fog) are mixed with smoke or dust particles in the lower atmosphere. This exactly matches the given description.

Therefore the correct choice is (4) smog.

FINAL_ANSWER: d

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