check with the WHO, or in case you are interested in a particular country check with the health authorities of this country. Even if they do not have the information readily available they are most likely able to let you know where to get it.
Here in Brazil can be found on the website of the Ministry of Environment, however it is in Portuguese (http://portalms.saude.gov.br/). If you have interest I can go into this data and publish something together.