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臭氧污染来了,我们应该怎么办?
赵英民表示,臭氧的形成机理十分复杂,控制难度大。目前包括发达国家在内,臭氧污染也是尚未完全解决的大气污染问题。
“大气十条”要求控制臭氧生成的前体物,就是VOCs和氮氧化物的排放。对臭氧污染问题,我国已经采取了三方面行动:部署PM2.5和臭氧的协同控制;出台VOCs的治理政策标准;大幅度削减氮氧化物排放。
但赵英民同时指出,我国近几年臭氧污染显现,说明当前氮氧化物和VOCs控制力度不匹配,氮氧化物减排虽然取得了积极进展,但VOCs目前还没有得到有效控制,仍亟待加强。下一步,针对这些问题,我国将对工业源、移动源、生活源等多类污染源综合施策,在改善PM2.5同时遏制臭氧的污染。
监测数据显示,臭氧污染一般在凌晨较低,上午开始攀升,到中午达到较高水平,并持续至傍晚,夜间浓度逐渐降低。
专家表示,由于公众对臭氧的了解不够,同时臭氧污染往往在风和日丽的时候发生,更容易被人们忽视,从而埋下健康隐患。不同于PM2.5的预防,佩戴口罩对臭氧预防无效。专家建议,公众尤其是儿童、老人等体弱和敏感人群,在午后两三点臭氧污染最严重的时候尽量避免户外活动。室外臭氧浓度高时,应减少室内通风换气次数。
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