Module 4: Vehicle Emission Standards and Measurement
  Lecture17:Emission Standards
 


contd...

Table 4.4

US Federal Heavy Duty Engine Emission Standards, g/bhp-h, (US HD-Transient cycle)

Year CO HC NMHC + NOx NOx

PM

1988

15.5

1.3

-

10.7

0.60

1990

15.5

1.3

-

6.0

0.60

1991

15.5

1.3

-

5.0

0.25 (0.25)

1994

15.5 1.3 - 5.0

0.10 (0.07)

1996

15.5

1.3

- 5.0

0.10 (0.05) (1)

1998 15.5 1.3 - 4.0 0.10 (0.05)(1)

2004(2)

         

Option 1

15.5

-

2.4

-

0.10 (0.05)

Option 2 15.5 0.5 (3) 2.5 - 0.10 (0.05)
2007 15.5 0.14 (3) - 0.2 0.01

Note: values in parentheses apply to urban buses
(1)

PM standard in use is 0.07 g/hp.h
(2)

Engine manufacturers may use either of the two options.
(3)

NMHC limits apply.