1. Liu, J. & Lewis, G. Environmental toxicity and poor cognitive outcomes in children and adults. J Environ Health. 76, 130–138 (2014).
2. Lin, S. et al. Environmental lead pollution and elevated blood lead levels among children in a rural area of China. Am J Public Health. 101, 834–841 (2011).
3. Taylor, M. P. & Schniering, C. The public minimization of the risks associated with environmental lead exposure and elevated blood lead levels in children, Mount Isa, Queensland, Australia. Arch Environ Occup Health. 65, 45–48 (2010).
4. Rahama, S. M., Khider, H. E., Mohamed, S. N., Abuelmaali, S. A. & Elaagip, A. H. Environmental pollution of lead in traffic air and blood of traffic policemen in Khartoum State, Sudan. East Afr J Public Health. 7, 350–352 (2010).
5. Flegal, A. R. & Smith, D. R. Lead levels in preindustrial humans. N Engl J Med. 326, 1293–1294 (1992).