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A city worker recently wrote to find out which respirator would filter out the strong smells at the landfills best. He writes, "I work for sanitation in NYC. Sometimes I have to bring the garbage to landfills and dump it out the back of my truck. I am stepping in waste - horrible smelling - especially in the summer when the sun hits it. Rotten eggs, food, diapers, blood, cleaning chemicals, and sometimes dead animal bodies. What should I use that would mask out these smells? Should I consi …