Does the Environmental Kuznets Curve Describe How Individual Countries Behave?
研究了单个国家内收入与空气污染物（二氧化硫、烟雾、颗粒物）浓度的时间序列数据，检验污染-收入关系是否符合环境库兹涅茨曲线假说。
<i>We examine within-country time series data on income and concentrations of SO<sub>2</sub> smoke, and particulates to see if the shapes of pollution-income relationships in individual countries agree qualitatively with predictions of the environmental Kuznets curve. The shapes of these relationships are determined non-parametrically for individual countries using recently available data on air pollution concentrations. For smoke and particulates, the shapes of within-country, pollution-income patterns do not agree with the EKC hypothesis more often than chance would dictate. For SO<sub>2</sub> which generally exhibits EKC- consistent pollution-income relationships among wealthier countries, the observed patterns are also consistent with a simpler hypothesis.</i>