| Keyword | CPC | PCC | Volume | Length string | Score |
|---|---|---|---|---|---|
| ambient pm2.5 | 0.36 | 0.6 | 8823 | 13 | 51 |
| ambient pm2.5 exposure | 1.39 | 0.9 | 9033 | 22 | 63 |
| ambient pm2.5 concentrations | 1.92 | 1 | 6921 | 28 | 98 |
| ambient pm2.5 caused depressive | 0.74 | 0.9 | 2709 | 31 | 71 |
| national ambient air quality standards pm2.5 | 1.62 | 0.1 | 4686 | 44 | 92 |
| what does pm2.5 cause | 0.05 | 0.1 | 1789 | 21 | 51 |
| why is pm2.5 bad | 1.49 | 0.3 | 9722 | 16 | 25 |
