BEIJING—Visibility in parts of Beijing was less than 219 yards on Friday as heavy pollution shrouded the Chinese capital, forcing the closures of some highways. Beijing issued its first heavy pollution alert for the fall and winter on Thursday, requiring the suspension of some outdoor construction, factory operations, and outdoor school activities. Visibility has been severely limited with the tops of the city’s tallest buildings vanishing in the haze. The Beijing-Tianjin-Hebei region often suffers from heavy smog in the fall and winter, especially on days without wind. A cold wave arriving from Siberia over the weekend is expected to disperse the pollution. China aims to cut concentrations of hazardous, small airborne particles known as PM2.5 by an average of 4 percent year on year in main cities this winter, the environment ministry said last month. The PM2.5 level in urban areas reached as high as 234 micrograms per cubic meter …