For historic reason, the World Air Quality Index project has been using the China MEP (Ministry of Environmental Protection) designation for the air quality levels. This is now past history, and the designation will follow, from now on, the US EPA (Environmental Protection Agency) AirNow standards.
The table below summarizes the differences in designation between the two standards, as well as the translations for the various languages.
| AQI Range | Old MEP Designation | New EPA AirNow Designation | New Chinese translation | New Japanese translation | New Korean translation | New Russian translation | Color coding |
| 0-50 | Excellent | Good | 优 | 優 | 파랑 | Среднее | |
| 51-100 | Good | Moderate | 良 | 良 | 초록 | Неподходящее для особо восприимчивых | |
| 101-150 | Lightly Polluted | Unhealthy for Sensitive Groups | 轻度污染 | 軽微汚染 | 노랑 | Плохое | |
| 151-200 | Moderately Polluted | Unhealthy | 中度污染 | 軽度汚染 | 주황 | Нездоровое | |
| 201-300 | Heavily Polluted | Very Unhealthy | 中度污染 | 中度汚染 | 빨강 | Очень нездоровое | |
| 301-500 | Severely Polluted | Hazardous | 重度污染 | 重汚染 | 갈색 | Опасное |
Please note that for now, this is only the Designation for the website which is updated. The designation for the Android application will follow soon.
(中文版请点击此处 )
