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Table 3 P-values of pre-shutdown and pre-rollback PM2.5 values for treatment–control counties (two-sided paired t-test)

From: Association of temporary Environmental Protection Agency regulation suspension with industrial economic viability and local air quality in California, United States

Frequency Treatment–control pair
Contra Costa–Sacramento Napa–Sutter
Weekly 0.003271 0.7945
Daily 2.60E-07 0.621