A World Health Organization report
released on May 2 found that Delhi has the worst air quality in the world. India's
capital was found to have a heavy presence of PM10 particular matter - 292 micrograms per cubic meter. The annual safe limit set by the WHO is 60. While 13 Indian cities are among the 20 most-polluted worldwide, the following infographic provides an overview of how Delhi compares to other major global cities.