Hong Kong CNN — A severe sandstorm has cloaked Beijing and China’s northeastern regions for the fourth time in a month forcing some residents to stay indoors to protect themselves from dense air pollution. Images showed the Chinese capital engulfed in a cloud of orange haze on Monday which hung thick in the air into Tuesday, though conditions have begun to ease. Beijing authorities told children and the elderly to stay indoors, and healthy adults were advised to refrain from outdoor activity. Residents were also reminded to keep their windows shut and wear masks and face shields. On Monday, the...