Local Residents' Perceptions for Ecosystem Services: A Case Study of Fenghe River Watershed.

Int J Environ Res Public Health · 2019 · PMC6801443 · PMID 31561464

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an increasing trendno p-value reported

According to the relevant literature [ 50 ], from 1960 to 2012, the number of haze days showed an increasing trend of fluctuation in Xi’an.

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