Emissions of greenhouse gases -- believed to contribute to global warming -- measured 1,820 grams per mile
from the hybrid bus, compared to 2,779 grams from the diesel bus and 2,708 grams from the CNG bus.
032 grams per mile
of HC (unburnt hydrocarbons), 0.
8 (1) the numbers are FTP weighted grams per mile
(NOx = Nitrogen Oxides (Various gases collectively forming Oxides of Nitrogen, and the main cause of ground smog and acid rain) CO = Carbon Monoxide, HC = Hydrocarbons, MPG = Miles e', over which automobile exhaust gases pass and are converted into an almost harmless end product.
The levels of ozone causing compounds in automobile emissions has decreased from 16 grams per mile
in 1960 to less than 5 in 1990.
030 grams per mile
, an 88 percent reduction over the current United States standard and well below the ULEV standard that will be in place in the year 2000.