Heavy smog lingered across north China today, causing the cancellation of flights and road closures.
The average density of the fine particulate matter PM2.5 in Beijing's six downtown districts was 279 micrograms per cubic meter at 2 p.m, according to the Beijing Environmental Protection Monitoring Center. Many pedestrians in the capital chose to wear masks while outside. Visibility was less than one kilometer in some areas.
Poor visibility also caused Beijing's smaller Nanyuan Airport to cancel some flights today.
Hebei, Shandong and Liaoning provinces, as well as Tianjin Municipality, all issued a yellow alert for smog. Most expressways in Hebei were shut due to dense fog. The PM2.5 reading was 178 micrograms per cubic meter at noon today in Shenyang, capital of Liaoning, which also issued a yellow alert.-Xinhua