41.   Choosing a modern car may reduce other harmful emissions such as nitrogen oxides and volatile organic compounds, van Wee concedes.

42.   Controlling the smallest particles means limiting emissions of nitrogen oxides and sulfur oxides, which come from gasoline and diesel engines and power plants, among other sources.

43.   Current federal regulations allow cars to emit four-tenths of a gram of smog-causing nitrogen oxides for each mile traveled.

44.   Emissions of sulfur dioxides and nitrogen oxides have fallen in Alabama over the last decade, as they have across the country.

45.   First, even though sulfur dioxide levels in the air have fallen dramatically, concentrations of a second major ingredient of acid rain, nitrogen oxides, have not.

46.   FERC commissioners said extensive studies showed the plan is likely to have little effect on emissions of nitrogen oxide.

47.   Full-size sport utility vehicles and pickups are currently allowed to emit three times as much smog-causing nitrogen oxide per mile as cars, for example.

48.   He argued that there is no scientific proof that nitrogen oxide from West Virginia can reach Massachusetts, as Massachusetts argued.

49.   Heavy-duty engines are now regulated by the Clean Air Act, under which they cannot produce more than five grams of nitrogen oxides to a brake horsepower hour.

50.   His campaign proudly notes that he signed legislation last year mandating major cuts in nitrogen oxide and sulfur dioxide emissions by grandfathered power plants.