| Global warming and climate change | 231 (23.1) | 405 (40.5) |
| Electromagnetic wave (appliances, mobile phones) | 201 (20.1) | 330 (33.0) |
| Endocrine-disrupting compounds | 123 (12.3) | 258 (25.8) |
| Outdoor air pollution | 105 (10.5) | 195 (19.5) |
| Food contamination | 98 (9.8) | 210 (21.0) |
| Water pollution | 55 (5.5) | 132 (13.2) |
| Radiation exposure | 47 (4.7) | 78 (7.8) |
| Heavy metal exposure (lead, mercury, cadmium) | 36 (3.6) | 95 (9.5) |
| River and marine pollution | 32 (3.2) | 95 (9.5) |
| Soil pollution (gas station/abandoned mine/landfill) | 28 (2.8) | 67 (6.7) |
| Noise and vibration | 22 (2.2) | 66 (6.6) |
| New chemical materials (nanomaterial) | 11 (1.1) | 45 (4.5) |
| Indoor air pollution (home, office) | 11 (1.1) | 24 (2.4) |