Okay, here is the question, I am a little clueless on where to start, on how I would go about solving this. Any help is greatly appreciated. Thanks The rubber worn from tires mostly enters the atmosphere as particulate pollution. Estimate how much rubber (in kg) is put into the air in the United States every year. To get you started, a good estimate for a tire tread's depth is 1cm when new, and the density of rubber is about 1200kg/m^3.