ISSN: 2056-3736 (Online Version) | 2056-3728 (Print Version)

An Empirical Study of Some Driving Factors of CO2 Emissions: Evidence from Quantile Regression


Correspondence: Yaya KEHO,

Ecole Nationale Supérieure de Statistique et d’Economie Appliquée (ENSEA) Abidjan, Côte d’Ivoire

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A growing body of research has examined the determinants of CO2 emissions. This literature has used mean-based regression methods in which only the mean effects of covariates are estimated. In this paper, we use the quantile regression methodology for a panel of 45 countries to investigate whether or not the factors that drive pollution do so in the same way for high and low pollution countries. The Environmental Kuznets Curve is confirmed and the positive effect of economic development is larger in low pollution countries. Energy consumption and financial development increase CO2 emissions and their effects are larger in countries with lower levels of pollution. Industrialization increases pollution especially in countries with higher level of pollution. Openness to trade and urbanization are negatively related to emissions in low pollution countries. All these findings suggest that pollution control policies should be tailored differently across low and high pollution countries.


  CO2 emissions, Energy consumption, GDP, trade openness, financial development, quantile regression.


Aka, B. F. (2008). Effects of Trade and Growth on Air Pollution in the Aggregated Sub Saharan Africa. International Journal of Applied Econometrics and Quantitative Studies, 5(1), 5–14.

Akin, C. S. (2014). The Impact of Foreign Trade, Energy Consumption and Income on CO2 Emissions. International Journal of Energy Economics and Policy, 4(3), 465–475.

Antweiler, W., Copeland B. and Taylor M. S. (2001). Is Free Trade Good for the Environment? American Economic Review, 91(4), 877–908.

Apergis, N. and Payne, J. E. (2009). CO2 Emissions, Energy Usage, and Output in Central America. Energy Policy, 37, 3282–3286.

Aslanidis, N. and Iranzo, S. (2009). Environment and Development: Is there a Kuznets curve for CO2 emissions? Applied Economics, 41(6), 803–810.

Baek, J. (2015). Environmental Kuznets curve for CO2 emissions: the case of Artic countries. Energy Economics, 50, 13–17.

Dinda, S. and Coondoo, D. (2006). Income and emission: A Panel data-based Cointegration Analysis. Ecological Economics, 57(2), 167–181.

Dinda, S., Coondoo, D. and Pal, M. (2000). Air quality and economic growth: an empirical study. Ecological Economics 34, 409–423.

Galeotti, M., Lanza A. and Pauli, F. (2006). Reassessing the Environmental Kuznets Curve for CO2 Emissions: A Robustness Exercise. Ecological Economics, 57, 152–163.

Halkos, G. E. (2003). Environmental Kuznets Curve for Sulfur: Evidence using GMM Estimation and Random Coefficient Panel Data Models. Environment and Development Economics, 8(4), 581-601.

Halkos, G. E., & Tsionas, E. G. (2001). Environmental Kuznets Curves: Bayesian Evidence from Switching Regime Models. Energy Economics, 23(2), 191-210.

Halkos, G. E., & Tzeremes, N. G. (2013). Carbon Dioxide Emissions and Governance: A Nonparametric Analysis for the G-20. Energy Economics, 40, 110-118.

Islam, F., Shahbaz, M., Ahmed, A.U. and Alam, M. (2013). Financial Development and Energy Consumption Nexus in Malaysia: A Multivariate Time Series Analysis. Economic Modelling, 30, 435–441.

Iwata, H., Okada K. and Samreth S. (2010). Empirical Study on Environmental Kuznets Curve for CO2 in France: the Role of Nuclear Energy. Energy Policy, 38, 4057–4063.

Jalil, A. and Mahmud, S. (2009). Environment Kuznets Curve for CO2 Emissions: a Cointegration Analysis for China. Energy Policy, 37(12), 5167–5172.

Koenker, R. and Bassett, G. J. (1978). Regression quantile, Econometrica, 46, 33–50.

Koenker, R. and Hallock, K. (2001). Quantile Regression. Journal of Economic Perspectives, 15(4), 143–156.

Koenker, R. and Machado, J. A. F. (1999). Goodness of fit and related inference processes for quantile regression. Journal of the American Statistical Association, 94, 1296–1310.

Kohler, M. (2013). CO2 Emissions, Energy Consumption, Income and Foreign Trade: a South African Perspective. Energy Policy 63, 1042–1050.

Lamla, M. (2009). Long-run determinants of pollution: A robustness analysis. Ecological Economics, 69, 135–144.

Martinez-Zarzoso, I. and Bengochea-Morancho, A. (2004). Pool Mean Group Estimation for an environemanl Kuznets curve for CO2. Economics Letters, 82(1), 121–126.

Nahman, A. and Antrobus, G. (2005). The Environment Kuznets Curve: A literature Review. South African Journal of Economics, 73, 105-120.

Perman, R. and Stern, D.I. (2003). Evidence from Panel Unit Root and Cointegration Tests that the Environmental Kuznets Curve does not exist. The Australian Journal of Agricultural and Resource Economics 47, 325–347.

Sadorsky, P. (2011). Financial Development and Energy Consumption in Central and Eastern European Frontier Economies. Energy Policy, 3(2), 999-1006.

Sadorsky, P. (2014). The Effect of Urbanization on CO2 Emissions in Emerging Countries. Energy Economics, 41, 147–153.

Sharma, S. S. (2011). Determinants of Carbon Dioxide Emissions: Empirical Evidence from 69 Countries. Applied Energy, 88(1), 376–382.