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Based on Beijing's air quality data and socio-economic data from 2015 to 2020, Kernel density estimation, spatial autocorrelation and random forest methods were used in this paper to analyze the air quality characteristics and influencing factors in Beijing from 2015 to 2020. The results showed that the concentration of particulate matter contributed the most to the change of AQI in six pollution components of air quality; the difference in air quality in the four seasons was decreasing; air quality was obviously related to social production activities and governance rules. As a whole, the Air Quality Index(AQI) in the north of the municipal area was low, while the air quality in the south was relatively high. The increase in per capita disposable income, green coverage area and scientific research funding could effectively reduce the degree of air pollution. [ABSTRACT FROM AUTHOR]

What impact do media have on public opinion when they are tightly controlled by the government, as in the People's Republic of China? Little reliable information is available for an answer, especially at the individual level This study is a secondary analysis of a stratified random sample of 870 Beijing residents concerning economic reform in China during the mid-1980s. They were questionnaire-interviewed in 1986 with a 90 percent response rate Regression and path analysis suggest that the government media were effective in increasing knowledge about reform and in affecting some attitudes, but it was less effective or totally ineffective in others. When compared with U.S. media studies, the magnitude of effects appears larger, a result consistent with message competition theory. This relatively new theory has been offered as an alternative to the classic `selective exposure' and `two-step flow' theories in explaining why little correlation has been found between individual media use and attitudes in the West. The theory predicts that competing messages tend to neutralize net effects of the media, while controlled media systems tend to show increased net effects. [ABSTRACT FROM AUTHOR]