The toxic top 10:
- Mercury pollution from gold mining
- Lead pollution from industrial parks
- Pesticides from agriculture
- Lead smelting
- Chromium pollution from leather tanning
- Mercury residue from other mining
- Lead pollution from mining
- Lead pollution from improper battery recycling
- Arsenic in groundwater
- Pesticide manufacturing and storage
Notably, groundwater arsenic is the only naturally occurring pollution problem—and it is in ninth place.