| 31. | Birmingham is in violation of federal air pollution standards for smog.
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| 32. | They also emit more nitrogen oxide, a contributor to smog.
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| 33. | When the smog lifted, ministers had some questions to answer.
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| 34. | Twice the normal number died in the week of the smog.
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| 35. | For years, smog levels have been measured in hourly averages.
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| 36. | Houston's smog season typically stretches from March to November.
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| 37. | One provision would ease rules on ozone, which produces smog.
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| 38. | But heavy smog obscured the view by millions of capital residents.
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| 39. | Heavy smog again obscured the view by millions of capital residents.
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| 40. | There was no terrorism, no smog, no gridlocked traffic.
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