6月23日6:00,北京实时空气质量指数为320,空气中首要污染物为PM10,污染级别6级,处于严重污染水平。建议措施:儿童、老年人和病人应当停留在室内,避免体力消耗,一般人群应避免户外活动。(北京市生态环境监测中心)
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