[4] Ellison G, Glaeser E L, Kerr W R. What causes industry agglomeration? Evidence from coagglomeration patterns[J]. American Economic Review, 100, 1195-1213(2010).

[5] Brodzicki T. Agglomeration patterns in the Polish manufacturing industry[J]. International Economics Letters, 1, 10-22(2012).

[8] Shao J A, Huang Z L, Deng H. Characteristics of nonpoint source pollution load from crop farming in the context of livelihood diversification[J]. Journal of Geographical Sciences, 28, 459-476(2018).

[11] Zeng D Z, Zhao L. Pollution havens and industrial agglomeration[J]. Journal of Environmental Economics & Management, 58, 141-153(2009).

[12] Hosoe M, Naito T. Trans-boundary pollution transmission and regional agglomeration effects[J]. Papers in Regional Science, 85, 89-94(2006).

[13] Liu S, Zhu Y, Du K. The impact of industrial agglomeration on industrial pollutant emission: Evidence from China under New Normal[J]. Clean Technologies & Environmental Policy, 19, 2327-2334(2017).

[14] He J. Pollution haven hypothesis and environmental impacts of foreign direct investment: The case of industrial emission of sulfur dioxide (SO₂) in Chinese provinces[J]. Ecological Economics, 60, 228-245(2006).

[18] Liu Y, Ji Y, Shao S et al. Scale of production, agglomeration and agricultural pollutant treatment: Evidence from a survey in China[J]. Ecological Economics, 140, 30-45(2017).

[21] Grossman G M, Krueger A B. Environmental impacts of a North American Free Trade Agreement, 8, 223-250(1991).

[22] Antweiler W, Copeland B R, Taylor M S. Is free trade good for the environment?[J]. American Economic Review, 91, 877-908(2001).

[23] Copeland B A, Taylor M. North-South trade and the environment[J]. Quarterly Journal of Economics, 109, 755-787(1994).

[24] Duranton G, Puga D. Nursery cities: Urban diversity, process innovation, and the life cycle of products[J]. American Economic Review, 91, 1454-1477(2001).

[27] Oosterhaven J, Broersma L. Sector structure and cluster economies: A decomposition of regional labour productivity[J]. Regional Studies, 41, 639-659(2007).

[29] Dinda S, Coondoo D, Pal M. Air quality and economic growth: An empirical study[J]. Ecological Economics, 34, 409-423(2000).

[31] Grossman G M, Krueger A B. Economic growth and the environment[J]. Quarterly Journal of Economics, 110, 353-377(1995).

[36] Wang Q Y. Fixed-effect panel threshold model using Stata[J]. Stata Journal, 15, 121-134(2015).

[37] Hansen B E. Threshold effects in non-dynamic panels: Estimation, testing, and inference[J]. Journal of Econometrics, 93, 345-368(1999).