2:01 PM ET 04/16/98 Beijing mops up after a mud bath By Andrew Browne BEIJING (Reuters) - The skies rained mud over Beijing Thursday. Clouds of fine brown dust swirling in from Inner Mongolia combined with thundery weather gave the Chinese capital a mud bath. Mud was caked on cars and bicycles and streaked on the raincoats of residents brave enough to venture outside under conditions that posed a greater-than-usual health hazard. Overnight thunderstorms left trees dripping with brown slime. The mud-slickened streets and choking air graphically demonstrated what Beijing authorities have only just publicly admitted -- the city is now China's most polluted metropolis.