The World Health Organisation (WHO) defines the environment in relation to health as “all the physical, chemical, and biological factors external to a person, and all the related behaviours”.
Hazardous smog blanketing China's north-east sparks more red alerts, with authorities advising residents in 10 cities to stay indoors.
The World Health Organisation (WHO) defines the environment in relation to health as “all the physical, chemical, and biological factors external to a person, and all the related behaviours”.
Hazardous smog blanketing China's north-east sparks more red alerts, with authorities advising residents in 10 cities to stay indoors.
