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Table 4 p values of pre- and post-shutdown and rollback PM2.5 levels (two-sided unpaired t-test)

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

Frequency County
Contra Costa Sacramento Napa Sutter
Weekly 0.3349 0.003492 0.1401 0.7499
Daily 0.1459 1.48E-08 0.01304 0.7815