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Legend (ORD/USEPA_NEI_2011)

Acetaldehyde (0)
Acrolein (1)
Arsenic (2)
Benzene (3)
1,3-Butadiene (4)
Chromium (5)
Diesel PM (6)
Formaldehyde (7)
Lead (8)
Naphthalene (9)
PAH (10)