Severe smog in north China grounds flights, closes highways and suspends production
Air quality at hazardous levels and not forecast to clear until Wednesday

Severe smog that has shrouded the northern port city of Tianjin has caused flights to be grounded and closed highways, local transportation authorities said on Sunday.
The city’s weather bureau issued an orange alert – the second highest in a four-tier system – for air pollution on Sunday morning as a new bout of smog began, Xinhua reported.
The bureau said the density of pollutants would reach its peak on Sunday and Monday.
Most air quality monitoring stations in the city warned of severe air pollution on Sunday morning. Air quality index (AQI) readings at some points even exceeded 400.

As of Sunday morning, 35 flights had been delayed or cancelled at Tianjin Binhai International Airport. All highways in and out of the city, except one, were closed due to extremely low visibility.