Law banning face masks sparks more protests and brings Metro and buses to a halt, but Fine Art Asia chief says impact on fair is minimal

Trump's tariff of 15% on Chinese art that went into effect 1 September also applies to the antiquarian trade, further frustrating dealers and auction houses

New 10% tax will come into force on 1 September and apply to all works originating from China, regardless of where they are imported from

Art organisations join other US businesses at a series of hearings this week in Washington, DC on the proposed 25% tariff on $300bn worth of Chinese goods