China bubble pie map of daily AQI showing pollution over main cities during Q1- 2014
In addition to our previous post, the above chart is showing that in average the days where air quality was good (AQI < 50) have been very limited over main chinese cities during the first quarter.
This ranking covers the 190 largest cities in China, about 416 Mil people, accounting for about 63% of the urban population.
Averaged over the urban population and during Q1-2014 period of 90 days, the daily AQI repartition had been the following:
- 8 days /90 days or only 9% of total days had AQI<50
- 37 days /90 days or 41% had 50<AQI <100
- 45 days or 50% had AQI>100
The area where the most polluted cities were located is shown in Figure 1 below. In this vast swath of land straddling the Northern and the Middle zones, urban citizens have seen virtually no days with AQI <50 during Q1 2014, apart Chongqing and Beijing.
Figure 2: China bubble pie of daily AQI zooming the Southern Chongqing-Shanghai-Guangzhou triangle of relative moderate pollution
The Southernmost cities of Haikou and Sanya located in Hainan "beautiful island" , were the only main cities with a majority of good air quality days: Haikou and Sanya had respectively 52 and 61 good days (AQI<50) on the 90 days period.