| Perilous drops? |
| Harmful downfall |
| Ecological danger |
| Environmental woe |
| Industrial fallout |
| Environmental hazard |
| Lightning by-product |
| Environmental problem |
| Harmful precipitation |
| Environmental concern |
| Corrosive air pollution |
| Deleterious precipitation |
| Destructive precipitation |
| One cause of deforestation |
| Environmentalist's concern |
| Corrosive stuff from the sky |
| Certain environmental concern |
| Environmental awareness topic |
| Pollutant linked to fossil fuels |
| Precipitation that can cause corrosion: 2 wds. |
| Environmental problem addressed in the Clean Air Act |