Exposure to diesel exhaust cause serious health problems in humans, including cancer, cardiac illnesses, respiratory problems and other serious health issues.

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Diesel exhaust contains over 100 individual hazardous chemical components, that when combined can result in as many as 10,000 chemical compounds.

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NIOSH argues that “there can be no safe level of exposure to a carcinogen” and therefore NIOSH’ Threshold Limit Value is “lowest feasible level” and NFPA recommends “no less than 100% effective capture” is acceptable.