（此前，）北京市气象局对即将到来的沙尘暴进行了预警，并建议居民们不要外出，以免沙尘天气危及健康。
The city 's weather bureau issued an alarm , warning a sandstorm was on its way , and advised citizens to stay in homes as the polluted weather was bad for their health .
北京市气象局