Panel Dataset on democratic governance and pollution, 1990-2023 (wide format)

This deposited file is the wide-format panel dataset for 155 countries (1990-2023), trimmed and cleaned to support replication of the results reported in the accompanying article, 'Pollutant persistence conditions heterogeneity in pollution governance.' A CompleteCase indicator flags the 128 countries with complete data that form the analytic sample used in the reported model. A second dataset, in long (pooled) format, is included for the same 128 countries. This format is required to conduct the formal joint test of cross-pollutant differences in a single pooled multilevel model.