Police in Wuhan, capital of Hubei province, detained two men for spreading rumors online about Monday's smoggy weather, police authority said.

A rumor said the condition was caused by "leaking chlorine gas" and a "boiler explosion at Wuhan Iron and Steel".

Police tracked down the two men who started the rumor and put them in administrative detention on June 11, according to a statement on Safety Wuhan, the micro blog of Wuhan’s public security bureau.

Local authorities said the air conditions were caused by burning straw.