| 1 | Factory chimneys foul the air with smoke. | |
| 2 | Now we are going to make some "space dust". | |
| 3 | Megan coughed hard because she was allergic to dust. | |
| 4 | But not all air pollution starts out as soot. | |
| 5 | Shah lowers his machine gun, smoke curling from the barrel. |
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