California Legislature Considering Bill Requiring Smog Testing for Motorcycles
Green Car Congress
MAY 4, 2009
The original 1975 standards applied to hydrocarbons (HC), one of the two most important contributors to smog, and carbon monoxide (CO), a toxic air pollutant. grams per kilometer (g/km) HC+NO x beginning with 2004 models and a Tier II standard of 0.8 g/km HC+NO x , compared to the 2004 Tier I standard of 1.4 g/km to 14.0
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