laws on the release of pollutants was positive and increased the emission levels of these pollutants. The sign of population effect coefficient in the studied years in this study was obtained with different signs. The effect of all environmental indicators in the model is significant, but the effect of industrial effluents among pollutants will make the environmental effect uncertain. Foreign direct investment was a very important factor in the emission of pollutants after the emission of wastewater and other greenhouse gases. The variable coefficient of FDI for all three models for wastewater was significant at 1% level and equal to 1.481, 1.371, and 2.306 in models 1 to 3, respectively . Conclusion:The negative effect of the foreign direct investment on environmental quality in the MENA region was confirmed, which established the truth of the hypothesis of pollution in the region. On the other hand, the impact of the population on wastewater and CO 2 emissions has positive effects on the quality of the environment. Policies and laws focus on environmental control and foreign direct investment, reducing the level of pollutants and improving the quality of the environment.