. 2015 Aug 7;10(8):e0135182. doi: 10.1371/journal.pone.0135182
© 2015 Zhang et al
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
Fig 2. Heavy metal pollution rates from potential sources.
