Pollutant or Pollutant Class Potential Sources Environmental Tobacco Smoke Lighted cigarettes, cigars, pipes Combustion Contaminants Furnaces, generators, gas or kerosene space heaters, tobacco products, outdoor air, vehicles. Biological Contaminants Wet or damp materials, cooling towers, humidifiers, cooling coils or drain pans, damp duct insulation or filters, condensation, re-entrained sanitary exhausts, bird droppings, cockroaches or rodents, dustmites on upholstered furniture or carpeting, body odors. Volatile Organic Compounds (VOCs) Paints, stains, varnishes, solvents, pesticides, adhesives, wood preservatives, waxes, polishes, cleansers, lubricants, sealants, dyes, air fresheners, fuels, plastics, copy machines, printers, tobacco products, perfumes, dry cleaned clothing. Formaldehyde Particle board, plywood, cabinetry, furniture, fabrics. Soil gases (radon, sewer gas, VOCs, methane) Soil and rock (radon), sewer drain leak, dry drain traps, leaking underground storage tanks, land fill Pesticides Termiticides, insecticides, rodenticides, fungicides, disinfectants, herbicides. Particles and Fibers Printing, paper handling, smoking and other combustion, outdoor sources, deterioration of materials, construction/renovation, vacuuming, insulation. Full Table from EPA Here.