They don't look the most appetising greens, speckled with dirt and coated with what looks like diesel particles.
Some scientific evidence suggests that tiny diesel particles, unlike those from natural gas engines, can worsen asthma.
The characteristics of cerium-laden diesel particles were also investigated.
The diesel particles have also been listed as a possible carcinogen by the California Air Resources Board, though other groups have disputed this finding.
The discussion is focused on systems developed or adapted recently for the physical characterization of diesel particles.
Buses, and the diesel particles they release, are a sensitive topic in northern Manhattan, where community groups and researchers think that sky-high asthma levels are related to the large number of buses housed and maintained north of 96th Street.
State and federal officials said the goal was to reduce emissions of smog-causing nitrogen oxide by 150 to 300 tons a year and of tiny diesel particles by 30to9090 tons a year.
They actually have smaller lungs.Ships are the biggest polluters, accounting for close to 60% of all diesel particles emanating from San Pedro bay, where the two big ports are located.
A wall-flow monolith filter placed in the exhaust stream of a diesel engine can effectively limit the emission of diesel particles through the monolith.
These results suggested that diesel particles using regular, undosed diesel fuels were already metal-catalyzed to some extent, most likely from metals in the lube oil.
This particular carbonaceous particulate matter, collected at high temperatures in cordierite diesel particulate filters (DPF), which are optimized for removing diesel particles from diesel engine exhaust emissions, appeared extremely refractory to extractions using the classical extracting conditions for these pollutants.
