(2) The suitability of the human environment in urban areas is better than that in non-urban areas and shows a decreasing trend from the south to the north circle.
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Comprehensive Evaluation and Analysis of Human Settlements' Suitability in the Yangtze River Delta Based on Multi-Source Data.
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The sentences
All three curves showed a trend from a steep increase to a slow increase, and in the place where the comprehensive suitability index of human settlements was 0.623, the cumulative speed of the three curves slowed down, indicating that the concentration of population and economy in the area with a high comprehensive suitability for human settlements was relatively small; that is, 0.64% of the land held 4.96% of the population and 7% of the economy.
AQI showed an increasing trend from south to north.