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In the study, it is aimed to determine under the Environmental Kuznets Curve Hypothesis whether the newly industrialized countries, which need high output in order to gain competitive advantage, provide their economic development by considering environmental policies. For this purpose, the hypothesis was tested with panel data analysis for the years 1980-2021. In the study, CADF unit root, Westerlund cointegration and Augmented Mean Group Estimator (AMG) tests were used. According to the obtained findings, although it is observed that there is a long-term relationship between the variables, it has been determined that the increase in per capita income in Brazil and Turkey reduces carbon emissions. In Mexico and the Philippines, it has been observed that increases in income and per capita income, respectively, increase carbon dioxide emissions. Although there is no statistical significance in terms of income per capita for the panel in general within the scope of newly industrialized countries that have not yet completed their development, it has been determined that increases in income used as a control variable increase CO2 emissions. The results show that the environmental Kuznets curve, which states that increases in per capita income first increase environmental pollution and then decrease it, is valid only in Brazil and Turkey. [ABSTRACT FROM AUTHOR]