China's environmental inspectors intensified pollution checks around Beijing as a new round of smog hit the region.

The new round of air pollution will continue in the Beijing-Tianjin-Hebei region between April 3 and 7, with the cities of Tianjin, Tangshan, Langfang, Puyang and Anyang issuing orange alerts, the second highest in the country's four-tier warning system.

To ensure policies on fighting air pollution, the Ministry of Environmental Protection said on its website that seven teams have been sent to Beijing, Tianjin as well as the cities of Shijiazhuang, Tangshan, Baoding, Xingtai and Anyang in neighboring Hebei and Henan provinces.

Inspectors found several companies in Tianjin and Baoding had failed to meet requirements for cutting pollutants, while some vehicles in Beijing failing to meet emission requirements.

The ministry urged local authorities to address the problem.

China has been under growing pressure to address air pollution as smog frequently smothers the country's cities.

The government aims to cut the density of inhalable particulate matter in major cities by at least 10 percent by 2017.