array(6) {
  ["reason"]=>
  string(60) "Daily API request limit exceeded. Please try again tomorrow."
  ["error"]=>
  bool(true)
  ["display_name"]=>
  string(12) "TP Hà Nội"
  ["city"]=>
  string(6) "ha-noi"
  ["district"]=>
  string(0) ""
  ["air_quality"]=>
  array(12) {
    ["time"]=>
    string(16) "2025-11-26T12:00"
    ["co"]=>
    int(485)
    ["nh3"]=>
    NULL
    ["no"]=>
    float(1.1)
    ["no2"]=>
    float(5.6)
    ["o3"]=>
    int(117)
    ["pm2_5"]=>
    float(18.1)
    ["pm10"]=>
    int(20)
    ["so2"]=>
    float(20.9)
    ["us_aqi"]=>
    int(99)
    ["eu_aqi"]=>
    int(68)
    ["_aq_updated_at"]=>
    string(19) "2025-11-26 05:56:51"
  }
}