Here are several articles that may help you. Note that the WHO is the World Health Organization.
http://www.bing.com/search?q=environment%20and%20public%20health&qs=n&form=QBRE&pq=environment%20and%20public%20health&sc=8-29&sp=-1&sk=&cvid=db4db60595334d28bd3a80eb1ed75c56
Types of environmental issues that can cause ill-health
2 answers
discuss the responsibilities of the road users to ensure safety for one another