| 1 | Smoking in confined areas can cause fires. | |
| 2 | I was scared of confined spaces and especially the dark. | |
| 3 | As a precaution, put them in an airtight freezer bag. | |
| 4 | Grab an airtight container and plant your flour in the refrigerator. | |
| 5 | Ventilation can help reduce the level of pollutants in closed rooms, the researchers said. |
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