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Table 1 PM mass, particle number (PN) and NOx emissions, and concentrations of PM-bound organic and inorganic constituents from exhaust gases of one Euro 2 and four Euro 6 cars. < DL indicates the measurements in which the results were below the detection limits

From: Toxicological evaluation of exhaust emissions from light-duty vehicles using different fuel alternatives in sub-freezing conditions

  DI-E2 CNG E10 E85 DI-E6
PM emissions
 PM mass (mg/km) 62.6 0.48 1.35 0.92 0.64
 PN (#/km) 1.28 × 1014 6.63 × 1010 7.63 × 1011 7.49 × 1011 5.62 × 109
Nitrogen oxides
 NOx (mg/km) 1150 201 31 16 463
Organic constituents
 Sum of total PAHs (μg/km) 32.2 0.53 6.52 5.44 0.97
Inorganic elements (mg/km)
 SO42− 0.125 < DL < DL < DL < DL
 NO3 0.125 < DL < DL < DL 0.053
 Cl 0.063 < DL < DL < DL < DL