No studies were found that estimate trip-based per passenger emission factors from exhaust emissions measured directly from the locomotive engine during operation.
These, he found, included volatile emissions from exhaust pipes, refineries and other industries, essential elements of smog.
Manufacturers told the DfT that devices to reduce emissions, called exhaust gas recirculation, tended to switch off when it was cold to protect the engine.
The traditional sources of atmospheric emissions (auto exhaust and industrial emissions) account for only about 20% of total exposure.
Similar to other combustion emissions, biodiesel exhaust emissions contain irritant gases and vapors such as nitrogen oxides, aldehydes, and a wide range of organic compounds, some of which are also likely to present an oxidative stress (Mauderly 1997).
Of the vehicular emissions, diesel exhaust (DE) has been found to be particularly noxious (Zielinska et al. 2004) because of its disproportionate richness in toxic compounds.
PM10 emission factors include both exhaust (emissions from tailpipe, obtained from ISPRA database based on COPERT IV calculations) and non-exhaust components (abrasion and resuspension processes, obtained from Gehrig determination [ 27]).
All other exhaust emissions, including other GHG emissions (CH4, N2O, etc)., were derived from emission measurements[5, 72, 73].
Some of the proven emission routes are domestic emission and wastes, automobile exhaust, industrial emission, agricultural activities, and also some natural sources.
That assessment of lung cancer risk was based on diesel exhaust emissions that predate the 2007 new emission standards.
