| 1 | Trees can also reduce the strong odor of ammonia gas. | |
| 2 | They can also reduce the strong smell of ammonia gas . | |
| 3 | The trees capture dust, ammonia and odors in their leaves. | |
| 4 | Ammonia gas released by fertilized cropland is a cause of air pollution , the . | |
| 5 | Ammonia gas released by fertilized cropland is a cause of air pollution. |
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