NGOs call for more info on pollution

An open letter signed by 23 NGOs urged environmental agencies at all levels on Thursday to disclose more information to the public about sources of pollution.

"So far, 2013 has seen a leap forward in open environmental information, as 74 cities are providing real-time air quality readings so people can protect themselves from airborne pollution, especially from fine particles," the letter said.

"But to make a real change, we need to actively reduce emissions rather than simply covering ourselves up."