https://aqicn.org/city/japan/nigata-shi-kita-ku-/shohin/
Matsuhama, Niigata-ken, Japan Air Pollution: Real-time Air Quality Index
Real-time air pollution index for 100+ countries
niigata kenjapan airreal timepollutionquality
https://aqicn.org/city/japan/zuodushi/zuodu/sr/
Hatano, Sado-shi, Niigata-ken, Japan Air Pollution: Real-time PM2.5 Air Quality Index (AQI)
Real-time Air Quality Index for more than 100 countries in the world