The World Health Organization warned on Tuesday that the “black rain” and toxic compounds in the air in Iran after strikes on oil facilities could cause respiratory problems, and it backed Iran’s advisory urging people ‌to remain indoors. The UN health agency, which has an office in Iran and works with authorities on health emergencies, said it has received multiple reports of oil-laden rain this week. Tehran was choked in black smoke on Monday after an oil refinery was hit, in an escalation in...