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The G20’s first-ever focus on air quality marks a vital step towards protecting health, climate, and sustainable growth.

CENTURION, SOUTH AFRICA - FEBRUARY 13: (EDITORS NOTE: A polarizing filter was used for this image.) A general view shows passing storm clouds during day two of the First Test match between South Africa and Australia on February 13, 2014 in Centurion, South Africa. (Photo by Morne de Klerk/Getty Images)