Quote:
Originally Posted by RustyLugNut
The legislated requirements have improved the air in the Los Angeles Basin but the total concentration of people in the bowl is causing air quality to worsen - the first time in decades.
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Very true and that is why trucks need to get cleaner and cleaner just to keep the status quo let alone improve air quality in urban centers. We have more and more trucks on the road hauling goods for more and more people.