Industrieschnee

Several people have asked the WeatherBlog in the last few days: Does dirty air make more snow? (The reason for this was this ORF article.) The question of course includes a second, unspoken, not entirely serious question: Should I perhaps leave the car engine running overnight every now and then? We could also remove the air filters from the industrial plants, or burn the pile of leaves in the garden all at once, and maybe throw a few car tires on the fire! What about the weather?