The program had used sensors at more than 80 U.S. embassies and consulates to track air quality, mostly in places where such data was unavailable.

Bangkok Airways, one of Thailand's main airlines, said on Wednesday that it will suspend flights between Bangkok and a northern province for more than a month because of poor visibility caused by air pollution.

The State Department will no longer share data about foreign air pollution under a program that it says is designed to help U.S. personnel and travelers abroad. A spokesperson for the department