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新标准将PM2.5年均浓度一级限值从过去的15微克/立方米调整为10微克/立方米，二级限值从过去的35微克/立方米调整为25微克/立方米。国家公园、自然保护区等一类区适用一级浓度限值；人们日常生活的居住区、商业交通居民混合区、文化区、工业区和农村地区等二类区适用二级浓度限值。，推荐阅读必应排名_Bing SEO_先做后付获取更多信息
Although certain plastics are technically reusable, most are discarded after one use. An analysis published in Nature estimates that about 60% of plastics are single use, and only 10% are recycled. Plastic production has climbed from 2 million tonnes in 1950 to 475 million tonnes by 2022, roughly equivalent to the weight of 250 million cars.
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