Air quality emission standards
Beijing chokes in heavy dust as sandstorm blows in
The alert would remain in place until 1200 GMT on Wednesday, the agency said.
The failures highlight the challenge Beijing faces in cleaning the nation’s notoriously toxic air during the winter when smog blankets colder regions as people crank up their heating.
Europe’s biggest automaker could face penalties of up to $18 billion in the United States.
How Volkswagen cheated on emissions