Abstract We argue that transboundary pollution can simultaneously undermine domestic accountability processes and heighten international tensions. We examine this empirically in the context of South Korea, notorious for severe air pollution that partly originates from China. We first show that most media stories and popular public petitions on air pollution emphasize China’s responsibility. We then combine data on daily air quality with survey data (2015–2022) and use instrumental variable regressions to show that on bad air days, South Koreans’ assessments of their own government’s environmental efforts remain consistent but their opinions of China’s leadership worsen. We thus find causal evidence that transboundary pollution contributes to growing public hostility between China and Korea. The findings may also help explain why Korea ranks lowest among OECD countries on air pollution and climate change policies. The research note concludes with broader implications for studying transboundary environmental issues.
Lee et al. (2026) studied this question.