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World Health Organization (WHO): Air pollution causes 7 million premature deaths a year

"WHO has adjusted almost all the air quality guideline levels downwards, warning that exceeding the new levels is associated with significant risks to health," the agency said. "Adhering to them could save millions of lives."

Pollution more dangerous than first thought

The WHO last issued air quality guidelines in 2005, which had a significant impact on environmental policies worldwide.

However, the organization said in the 16 years that followed, a much stronger body of evidence had emerged, showing how air pollution impacts on health at lower concentrations than previously understood.

"The accumulated evidence is sufficient to justify actions to reduce population exposure to key air pollutants, not only in particular countries or regions but on a global scale," the WHO said.

The new guidelines come ahead of the COP26 global climate summit which will be held in Glasgow from October 31 to November 12.

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