When you think you can smell snow, you aren’t actually smelling anything. It’s a sensory experience caused by colder weather, humidity, and the feeling of cold air. The cold slows down air molecules, humidity boosts your olfactory nerves, freezing air hits the nerve that transmits sensations from your face to your brain, and this creates the crisp ‘scent’ of snow. SourceSource 2
Sound changes when it snows. It seems quieter right after a snowfall because a blanket of fresh powder is absorbing the sound waves- but once the snow melts and refreezes, it then creates a reflective surface that amplifies sound by allowing it to travel farther than normal. SourceSource 2
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