空气质量日报

                                                                        以下为空气中主要污染物浓度均值，单位：微克/立方米。
                                                                          9月21日更新
                                                                                     PM2.5颗粒物                 PM10颗粒物
                                                                                             优   4                       优  13
                                                                                    SO2 二氧化硫                 NO2  二氧化氮
                                                                                             优   16                      优  5
                                                                                    O3 臭氧                      CO 一氧化碳
                                                                                             优   89                      优  0.3
                                                                                    空气质量指数（AQI）：45
                                                                                    空气指数指数级别：Ⅰ
                                                                                    空气质量指数类别颜色：绿色