Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in one northern Chinese city as the

Pop star Rihanna was asked to leave Abu Dhabi's Sheikh Zayed Grand Mosque complex for posing for "inappropriate" pictures outside one of the world's largest Muslim places of worship.

Authorities said they had taken action before the Barbadian diva entered the mosque itself, which is not off-limits to non-Muslims and has become a major tourist attraction in the