71.   Nitrogen oxides can produce ozone, the level of which exceeds federal standards in metro Atlanta in the summer.

72.   Nitrogen oxide, or NOx, comes from burning fossil fuels in cars and factories.

73.   Nitrogen oxides are the essential ingredients in ground-level ozone, a component of smog.

74.   Nitrogen oxides, the other major ingredient of smog, would also be cut sharply.

75.   Nitrogen oxides, when they mix with sunlight and heat, are a key component of eye-and lung-irritating ozone smog.

76.   Natural gas engines, for instance, still produce some carbon dioxide, a significant greenhouse gas, and nitrogen oxide, a component of smog.

77.   Nitrogen oxide from Midwestern coal-burning plants is carried on the wind to New England.

78.   Nitrogen oxides contribute to the formation of smog, which can cause haze as well as respiratory and other health problems.

79.   Now that new research shows nitrogen oxide also causes acid rain, Sen. Daniel Patrick Moynihan, D-N.Y., wants a similar program curbing those emissions.

80.   OH is created naturally by a reaction with nitrogen oxide, which is produced during lightning strikes.