Shanghai — on a good day.

Half of the top 20 cities in the world with the highest levels of PM2.5 were in India, according to the pollution data released by the WHO, which included 1,600 cities, the CNN said. Other cities with high levels were located in Pakistan and Bangladesh.

No Chinese cities ranked in the top 20 most polluted cities, despite thick, gray smog filling its cities and millions of residents commuting behind surgical masks, CNN said. Beijing reported 56 micrograms of PM2.5.

China’s Premier Li Keqiang this year that China would “declare war on pollution,” acknowledging that it was a major problem for the country.

PM2.5 refers to the diameter measured in microns of particulates such as ammonia, carbon, nitrates and sulfate — which are small enough to pass into the bloodstream and cause diseases such as emphysema and cancer.

The report also said that cities with the lowest level of pollution were located in Canada, the United States, Finland, Iceland and Sweden.