Example: air traffic controller
Polynuclear Aromatic
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THE ENVIRONMENTAL EFFECTS OF FREIGHT
www.oecd.orginclude benzene (a known carcinogen), toluene, polynuclear aromatic hydrocarbons, formaldehyde, cyanide, hydrogen sulphide, dioxin, and so on (Kürer pp. 485-6). Either because most governments do not yet regulate these emissions, or because much less is known about their impacts (the second point may