The UN shone a spotlight on global air pollution this week, noting that more than 6-billion people — a third of them children — regularly breathe air that is "so polluted it puts their health and wellbeing at risk".

Marking World Environment Day on Wednesday, UN secretary-general António Guterres said: "My message to governments is clear: tax pollution, end fossil fuel subsidies, and stop building new coal plants. We need a green economy, not a grey economy."

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