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[Editorial] India’s air pollution: a new government and global plan

In 2015, India’s Ministry of Health and Family Welfare reported that if no action is taken the ambient concentration of fine particulate matter (PM2·5) from transport sources in the country is expected to double by 2030. According to WHO’s 2014 database for ambient (outdoor) air pollution, India’s capital Delhi was the most polluted city of more than 1600 cities in the world. Delhi had a yearly mean PM2·5 concentration of 153 μg/m3—much higher than WHO’s air quality guideline of 10 μg/m3. Emissions from vehicles are the main cause of the pollution in the capital.