Travellers from countries with severe coronavirus outbreaks who arrive in some parts of China will have to undergo a 14-day quarantine, state media say.
Travellers from the virus hotspots of South Korea, Japan, Iran and Italy arriving in the capital will have to be isolated, a Beijing official has said.
Shanghai and Guangdong announced similar restrictions earlier.
Authorities are worried the virus might be imported back into the country.
Although most virus deaths have been in China, Monday saw nine times more new infections outside China than in.
Shanghai said it would require new arrivals from countries with “relatively serious virus conditions” to be isolated, without naming the countries.