空氣污染急升至「嚴重」水平 當局呼籲長者留在室內

英文原標題：Hong Kong elderly urged to stay indoors as air pollution spikes to serious levels

英文原摘要：Severe haze in Hong Kong over the past two days has prompted a government warning of serious health risks, with experts urging the elderly and vulnerable to stay indoors until sunset. Air quality health risk levels at some of Hong Kong’s roadside monitoring stations rose on Wednesday and Thursday, w