Table 6.
Emission factors of the 90th percentile window during the corresponding ISC test and the weighted emissions over the WHVC at 22 °C performed with the Diesel M3 Class III HDV (ISCIII) and CNG M3 Class I HDV (ISCI). Note that occasionally CH4 values can be higher or very close to THC ones, because the emissions were close to the instrument's detection limit. The emissions of the two vehicles were below the Euro VI limits (see Table 5).
| Bus by fuel type |
Test Cycle | CO2 (g/kWh) |
CO (g/kWh) |
NOx (g/kWh) |
THC (g/kWh) |
CH4 (g/kWh) |
NH3 (ppm) |
SPN23 (#/kWh) |
|---|---|---|---|---|---|---|---|---|
| Diesel | ISCIII | 771.7 | 0.227 | 0.393 | 0.011 | 0.011 | 1 | NA |
| WHVC | 856.8 | 0.137 | 0.396 | 0.004 | 0.001 | 2 | 1.9E+11 | |
| CNG | ISCI | 809.8 | 0.388 | 0.246 | 0.008 | 0.010 | 13 | 8.3E+09 |
| WHVC | 874.5 | 0.613 | 0.323 | 0.072 | NA | 2 | 1.7E+10 |