TASK1 hard

城市绿化与空气质量改善的关系

The chart below shows the relationship between the percentage of urban green space and the average air quality index (AQI) in five major cities over a period of ten years. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. *图表描述*：城市A在2010年绿化面积为15%，AQI为150（污染较重）；到2020年，绿化面积增至30%，AQI降至80。城市B同期从绿化20%增至35%，AQI从130降至70。城市C绿化面积从25%增至40%，AQI从100降至60。城市D绿化从10%增至20%，AQI从180降至120。城市E绿化从30%增至50%，AQI从90降至50。