A typical long-haul diesel truck travels an average of 72,000 miles annually. Diesel-powered trucks are though to be a major contributor of particulate matter less than 2.5 μm (PM) and nitrogen oxides (NOx) emissions from mobile sources. Assume the average long-haul diesel truck emits 8.67 g/mile of NOx. The annual emission rate (kg/yr) for NOx is most nearly: 15.2 Ⓒ 625 O 64.0 O 1.57

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