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World Environment Day: This year's Mask Challenge is aimed at creating air pollution awareness; know about annual event's history
World Environment Day 2019: UN warns of dangers of air pollution; messages calling for action flood Twitter
World Bicycle Day 2019: The annual holiday celebrates cycling for health, environment
World Environment Day: This 18-yr-old is waging a war against Mumbai's coastal road project; nature warriors show small steps can make big impact
