今天的天空超级蓝，白天日月同辉，傍晚云霞美。
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src="https://pic.app.jiuquhe.com/forum/20230403191309front2_0_254950_FviMIutjUSRI9YbgsrdJWZFoqJua.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" alt="" width="1000" height="667" data-qf-origin="forum/20230403191309front2_0_254950_FviMIutjUSRI9YbgsrdJWZFoqJua.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" /></p><p class="empty_paragraph"> </p><p class="qf_image big noneditable" contenteditable="false"><img src="https://pic.app.jiuquhe.com/forum/20230403191309front2_0_254950_Fhvds_yyW5mwQUzgWnhP1-_xsJ6s.jpg?watermark/1/image/aHR0cDovL3BpYy5hcHAuaml1cXVoZS5jb20vd2F0ZXJfaW1nXzIwMjAxMjA3XzQzOC5qcGc=/dissolve/100/gravity/SouthWest" alt="" width="1000" height="628" 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对，超级蓝 血雨腥风 发表于 2023-4-3 22:20
天很蓝
5点多的时候万里无云 封狼居胥 发表于 2023-4-3 21:54
最近天气不错
就是就是 通天教主 发表于 2023-4-3 21:28
蓝蓝的天空
白白的云朵 空气质量空气质量（Air quality）的好坏反映了空气污染程度，它是依据空气中污染物浓度的高低来判断的。空气污染是一个复杂的现象，在特定时间和地点空气污染物浓度受到许多因素影响。来自固定和流动污染源的人为污染物排放大小是影响空气质量的最主要因素之一，其中包括车辆、船舶、飞机的尾气、工业污染、居民生活和取暖、垃圾焚烧等。城市的发展密度、地形地貌和气象等也是影响空气质量的重要因素。 另外，“负氧离子”浓度是空气质量好坏的标志之一。根据世界卫生组织的标准，当空气中负氧离子浓度高于每立方厘米1000个—1500个时，才能称得上是“清新空气”。
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