An $850,000 Department of Energy (DOE) study of the weekend smog (ozone) situation in Southern California — illustrated by the accompanying exhibit — raises new questions about pending vehicle emissions-control strategy. A widely respected DOE scientist, Douglas Lawson, says the increase in ozone levels during weekends is almost certainly due to reduced oxides of nitrogen (NOx) emissions because of fewer commercial vehicles (largely diesel-powered) on the road, in conjunction with reduced ...
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