http://gamapserver.who.int/gho/interactive_charts/phe/oap_exposure/atlas.html
Link to World Health Org numerical rating, lower is better, by country. USA, Canada, Australia and a number of others all in single digits. China, India are two worst.
Link to World Health Org numerical rating, lower is better, by country. USA, Canada, Australia and a number of others all in single digits. China, India are two worst.