Comprehensive Evaluation of Environmental Air Quality Based on the Entropy Weights and Concentration Variation Trends of Pollutants

The comprehensive index method has difficulties in evaluating the influence of air pollutant concentration changes on ambient quality. Thus, a evaluation based entropy weights and trend-regulating factors is proposed. According to information rates 6 pollutants, single weight proposed by integrating it with single-quality index, which reflects variations periods. Spearman’s rank correlation coefficient between Air Quality Index (AQI) defined as factor, indicates correlations pollutants improvements or retrogressions covariance used determine variation trend quality, decides positive negative factor. This study quality 10 cities Shaanxi Province from 2017 2022. trends vary among central, northern, southern cities. central have more spaces for terms PM2.5 O3. Although prevention efforts reduced impacts still key factor affecting most winter. Additionally, O3 pollution summer was not controlled effectively. contribution increased, contrary improvement coordinated control an important improvement.