by Robin MILLARD Agence France-Presse GENEVA, Switzerland (AFP) – The World Health Organization strengthened its air quality guidelines on Wednesday, saying air pollution was now one of the biggest environmental threats to human health, causing seven million premature deaths a year. Urgent action is needed to reduce exposure to air pollution, said the UN body, ranking its burden of disease on a par with smoking and unhealthy eating. “WHO has adjusted almost all the air […]