North China’s Tianjin Municipality issued a yellow alert for air pollution and activated emergency response measures on Saturday.

According to the city’s environmental protection bureau, the Air Quality Index (AQI) reading passed 200 around noon, with the PM2.5 reading exceeding 150 micrograms per cubic meter.

Emergency measures included banning heavy trucks in the downtown area and suspending dusty construction site work.

The bureau said that increased coal consumption, unfavorable weather conditions and fireworks were to blame for the smog.

The smog will disperse Sunday, the bureau said.

Beijing, which is adjacent to Tianjin, issued a blue alert for air pollution on Friday.

Hangzhou, a city in east China’s Zhejiang Province, which banned fireworks displays in its six main districts, reported improved air quality over the Spring Festival week.

On midnight Jan. 28, the Lunar New Year’s Eve, the traditional time to set off fireworks, the PM2.5 density was 42 micrograms per cubic meter, the lowest in five years.

China’s Ministry of Public Security announced Saturday that 611 missing children were found last year, following the launch of an app in May.

During the period, 648 updates on missing children were posted. Of the 611, 27 had been abducted and 358 had run away from home, according to the ministry.

A new version of the platform that went live in November has expanded its reach through cooperation with other popular mobile apps, such as Amap,Taobao, Baidu, QQ and Didi Chuxing.

Users near where a child disappears receive push notifications, including photos and descriptions. The scope of these push notifications will be expanded over time.

Central China’s Henan Province added 7.55 million mu (around 500,000 hectares) of high-yield farmland in 2016, as the grain base modernizes its agriculture, according local officials on Saturday.

The province, which produces a tenth of China’s grain, plans to upgrade 63.69 million mu of farmland by 2020, according to the local high-yield grainfield office.

So far, about 53.57 million mu has been upgraded to high-yield, 84.1 percent of the overall target. In 2016, the provincial government spent 9.94 billion yuan (1.44 billion U.S. dollars) on the project.

Agricultural machinery and professional fertilizing methods are used to support the endeavor.

The province also established an information system which contains information on location of the fields and agricultural knowledge enquiry points, soil conditions and meteorological conditions.