fix: 导出数据均值多算0

cjl

2023-07-21 e414c2eb234515e07e4f041e1dc80c7589fbf41a

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{
  "a34004": "PM2_5",
  "a34002": "PM10",
  "a05024": "O3",
  "a21004": "NO2",
  "a21005": "CO",
  "a21026": "SO2"
}