| 1 | Industrial wastes are poisoning the atmosphere of the country. | |
| 2 | An engine emits smoke from its funnel into the air. | |
| 3 | It can at least carry heavy equipment above most of the atmospheric mass. | |
| 4 | If it were not for oxygen and nitrogen in the air, no man could live on the earth. | |
| 5 | Nevertheless we feel that the results may improve our knowledge of the atmosphere. |