Table 4.
Average regulated emissions summary for three FTP composite cycles (1/7 × cold-start + 6/7 × hot-start), one per 2010 engine
| 1998 EPA standard (g/bhp-hr) | 2010 EPA standardd (g/bhp-hr) | 2010 Average emissions (g/bhp-hr) | Percent reduction relative to 1998 standard | Percent reduction relative to 2010 standard | |
|---|---|---|---|---|---|
| PM | 0.1 | 0.01 | 0.0008 ± 0.0008 | 99 | 92 |
| CO | 15.5 | 15.5 | 0.50 ± 0.71 | 97 | 97 |
| NMHCc | 1.3a | 0.14 | 0.000 ± 0.000 | >99 | >99 |
| NOX | 4.0b | 0.20 | 0.078 ± 0.038 | 98 | 61 |
Notes: aEPA limit was based on total hydrocarbon including methane.
bEPA limit went to 2.4 g/hp-hr in 2004.
cNMHC is reported as the difference between measured THC and methane.
dOnly NOX standard was lower in 2010 compared to 2007.