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The Congestion Mitigation and Air Quality Improvement Program

Figure 8

Note: This information was archived in September 2013. For current information, see

Emissions of a Typical Car on the Road in 1997, for a 5-Mile Trip
(numbers are approximate)
Cold Start 2.5 19.5 2.1
Running exhaust 2.7 33 6.8
Running loss 1.6    
Hot soak 1.2    
Parking all day 3.9    

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Updated: 9/23/2013
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000