Where can I find the number of days with good air quality in each province?

The days with good air quality in each province can be found on China Weather Online. China Weather Network is the official authority, which publishes the weather forecast every three hours. Provide one-week weather forecast, 15 weather forecast, 40-day weather forecast, weather information, air quality, life index, travel, traffic weather and other query services. You can query the number of days with good air quality in each province.