Table 1.
Chemical classes and key sources.
| Compound | Source |
|---|---|
| Organic | |
| n-Alkanes | Vegetative detritus, vehicles (diesel) |
| Branched alkanes | Vegetative detritus, motor vehicles |
| Alkane dioic acids | Secondary organic aerosol |
| Aromatic dioic acids | Secondary organic aerosol |
| Benz(de)anthracene-7-one | Coke, other combustion |
| Carboxylic acids | Combustion sources, vegetative detritus, microbes |
| Cholesterol | Meat cooking |
| Hopanes and steranes | Vehicle emissions, lube oil |
| LG | Wood combustion |
| Nonanal | Meat cooking |
| PAHs | Combustion (wood, coke, motor vehicles) |
| Resin acids | Wood combustion |
| OC | Combustion (wood, meat, motor vehicles) |
| Inorganic | |
| Ammonium | Agriculture/livestock and gasoline exhaust |
| EC | Diesel, other combustion |
| MMOs and other metals | Resuspended (road) dust |
| Manganese | Motor vehicles and road dust |
| NO3− | Combustion (wood, meat, motor vehicles, coal) |
| Lead | Motor vehicles and road dust |
| SO42− | Combustion (coal, motor vehicles, others) |
| Zinc | Motor vehicles and road dust |