关键词: 空气污染指数, 环保投入, 多断点回归

Abstract: Local environmental inputs’ positive change with the pollution levels is the internal financial mechanism which could alleviate the problem of environmental pollution. According to the classification rules of API, the research makes use of multiple regression discontinuity model to test the impact of air pollution on the local environmental protection expenditure. Empirical results show that: the aggravating of low level air pollution could cause a decline of environmental expenditure rates, but the high level air pollution could not. It analyzes the “inverse regulation” reaction mechanism based on the sample regression, and finds that there are not the cutoff effect on the environmental expenditure rates in the model cities for environmental protection, while there are the negative cutoff effects on the non-environmental protection model cities. In the provincial and vice-provincial cities there are no cutoff effect, while the breakpoint effect is still obvious in other cities. This suggests that it exists the heterogeneity among the local governments in solving the pollution problems. It is important to build and improve the incentive and constraint mechanism for the local environmental protection expenditure to control pollution.

Key words: Air pollution index, Environmental protection expenditure, Multiple-cutoffs regression discontinuity