BEIJING — China will lower the service charges of ports to optimize the business environment and promote the work resumption of logistics firms, according to an official circular.

The circular, issued by the Ministry of Transport and the National Development and Reform Commission, said port charges for cargo and facilities security will be cut by 20 percent from March 1 to June 30.

The measure is expected to save enterprises and shippers 380 million yuan (about $54.87 million), the circular said.

Mandatory emergency response fees for cargo ships other than oil tankers will also be canceled.

Cooperation between ports, shipping companies and cargo owners should be strengthened and port operators are encouraged to give preferential treatment to small and micro enterprises affected by the novel coronavirus outbreak, it said.

In the meantime, the circular called for stronger supervision over the international shipping and port markets, and a crackdown on illegal activities.