京津冀及周边地区发生今年秋冬季以来首次PM2.5污染过程|精品国产乱码久久久人妻
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中新社北京10月28日电 (记者 阮煜琳)23日起,京津冀及周边地区中南部率先出现细颗粒物(PM2.5)污染,近几日呈范围扩大、程度加重态势,局地出现中度污染。针对此次污染过程,多地积极采取行动,科学依法启动重污染天气预警。
国家大气污染防治攻关联合中心密切关注此次过程,邀请中国环境科学研究院柴发合研究员,解读污染成因。进入秋冬季后,京津冀及周边地区先是经历了连续的“优良天”,近期出现了首次区域性PM2.5污染过程。28日,区域扩散条件再次系统性转差,京津冀中南部、山东西部、河南北部形成连片污染带。
分析本次污染过程出现的原因,专家指出,一是区域污染排放维持高位。从颗粒物组分特征来看,在污染高值时段,区域PM2.5硝酸盐占比超四成,表明工业、柴油车(机)排放的氮氧化物及其二次转化是本次污染的主要原因。二是静稳、高湿、逆温等多因素叠加,区域气象条件明显转差。本次污染过程呈现出典型的“累积-短暂缓解-加重”的阶段性特征。三是受本地排放和区域污染影响,北京市PM2.5浓度快速上升。
京津冀及周边地区城市根据空气质量预测预报情况,及时启动重污染天气预警,采取绩效分级差异化管控措施。截至28日,京津冀及周边地区17个地级及以上城市(新区)依法启动预警。
中国环境监测总站预计,30日,受东北弱冷空气影响,京津冀中北部城市空气质量有所改善,河北中南部及河南北部城市仍可能出现短时中至重度污染。31日,受偏西北冷空气持续作用,区域空气质量自北向南逐步改善。(完)
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