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Originally Posted by Big Dave
Was the air quality in 1998 (a year someone else brought up but certainly pre-ULSD and pre-Tier II) that bad?
I don't seem to remember it being that bad back then and I haven't seen any improvement since Tier II/ULSD.
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It isn't for most places, just for some. For instance, roughly 1 out of every 2,000 people living near the port of LA will get lung cancer due to diesel emissions.
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“What we are saying is that on top of that, 100 [in the study area] are going to have cancer for no other reason than the diesel pollution from the ports,” Martin said. He said lung cancer is the primary risk from diesel fumes. Lung cancer is usually fatal.
The 53,000 people who live nearest the two seaports face a risk exceeding 500 in a million from port pollution alone, according to the study.
[...]
Earlier research had found that diesel fumes accounted for 71% of the cancer risk associated with air pollution in the Los Angeles region.
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Ideally, we could let people over in the mid-west have their AQ regs and people in CA have theirs for diesels, and we do for the most part, but as it turns out it's cheaper to just fit everything w/ emissions equipment rather than keep entire trucking fleets within certain geographical boundaries.