Are negative ions dangerous?

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Tags

1. #particles
2. #charge
3. #either
4. #electric
5. #negative
6. #beneficial
7. #concentrations
8. #invisible
9. #harmful
10. #while
11. #charged
12. #molecules
13. #positive
14. #natural
15. #atoms
16. #highest
17. #human
18. #which
19. #clean