| 11. | Past efforts to devise transregional smog controls have not gone smoothly.
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| 12. | Gasoline vapors contribute to smog and have been linked to cancer.
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| 13. | I live amid concrete and smog, red bricks and pigeons.
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| 14. | Her husband, Dale, is a gas station smog technician.
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| 15. | Q : What's the difference between smog and haze?
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| 16. | UNDATED : What's the difference between smog and haze?
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| 17. | Smog has caused entire Chinese cities to disappear from satellite photographs.
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| 18. | "There's no smog or congestion ."
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| 19. | Many of these ( smog-reducing efforts ) were voluntary.
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| 20. | Or that there is smog and traffic congestion in Southern California.
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