NUMBEO

Pollution Comparison Between China and Japan Reverse

For major cities in those countries you could get probably more relevant data by specifying cities itself.
City in China:
City in Japan:
Index   InfoChinaJapan
Pollution Index:    81.15    36.67
Pollution Exp Scale:    147.32    58.61

Pollution China vs Japan

ChinaJapan
Improve Data Improve Data
Air Pollution
Very High 82.12
Low 32.03
Drinking Water Pollution and Inaccessibility
Moderate 59.42
Low 27.79
Dissatisfaction with Garbage Disposal
Moderate 51.29
Low 26.48
Dirty and Untidy
Moderate 52.56
Low 23.84
Noise and Light Pollution
Moderate 56.34
Moderate 40.29
Water Pollution
High 67.88
Low 34.84
Dissatisfaction to Spend Time in the City
High 72.06
Low 29.22
Dissatisfaction with Green and Parks in the City
Moderate 42.93
Low 33.10
Contributors:1293364
Last Update:July 2019July 2019

Purity and Cleanliness China vs Japan

ChinaJapan
Improve Data Improve Data
Air quality
Very Low 17.88
High 67.97
Drinking Water Quality and Accessibility
Moderate 40.58
High 72.21
Garbage Disposal Satisfaction
Moderate 48.71
High 73.52
Clean and Tidy
Moderate 47.44
High 76.16
Quiet and No Problem with Night Lights
Moderate 43.66
Moderate 59.71
Water Quality
Low 32.12
High 65.16
Comfortable to Spend Time in the City
Low 27.94
High 70.78
Quality of Green and Parks
Moderate 57.07
High 66.90
Contributors:1293364
Last Update:July 2019July 2019