| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when did people realize lead was poisonous | 1.51 | 0.4 | 3984 | 92 |
| when did lead poisoning start | 1.77 | 1 | 2433 | 93 |
| when was lead discovered to be toxic | 0.6 | 0.8 | 3390 | 89 |
| when was lead poisoning discovered | 0.96 | 0.9 | 5112 | 65 |
| history of lead poisoning | 0.71 | 0.2 | 6702 | 36 |
| when was lead known to be toxic | 0.35 | 0.9 | 2708 | 52 |
| who discovered lead poisoning and when | 0.6 | 0.6 | 1901 | 22 |
| lead poisoning history timeline | 0.57 | 0.4 | 8576 | 32 |
| when did we learn lead was toxic | 0.85 | 1 | 3692 | 36 |
| do people before 1995 have lead poisoning | 1.17 | 0.8 | 3241 | 46 |
| when was lead toxicity discovered | 0.68 | 0.6 | 8023 | 94 |
| lead poisoning know the facts | 1.03 | 0.4 | 7958 | 97 |
| facts about lead poisoning | 0.52 | 0.5 | 5433 | 58 |
| history of lead exposure | 1.82 | 0.8 | 5179 | 72 |
| is lead poisoning real | 0.9 | 0.2 | 4371 | 99 |
| lead poisoning in the news | 1.68 | 0.1 | 8447 | 23 |
| lead poisoning recent cases | 1.52 | 0.1 | 9967 | 97 |
| lead poisoning in usa | 0.11 | 0.4 | 8723 | 94 |
| lead poisoning in united states | 0.4 | 0.2 | 5331 | 42 |
| lead poisoning in the us | 1.57 | 0.5 | 2413 | 55 |
| how rare is lead poisoning | 1.04 | 0.3 | 4642 | 17 |
