July 25, 1991IN THE MATTER OF: ) R90—20DIESEL VEHICLE EXHAUST ) (Rulemaking)OPACITY LIMITS ) PROPOSED RULE.
Diesel engines do, however,
emit relatively high levels of NOx, and sulfurous emissions fromdiesel engines are currently about 10 times that of comparablegasoline engines due to the higher sulfur content of diesel fuel.
Virtually all the PM emitted by
diesel vehicles is less than 10 microns in diameter and isreferred to as P11-10.
Although the evidence is
considered limited, collectively, human epidemiologic studiesshow a positive correlation between diesel exhau...
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