Illinois’ phases, tiers explained: Here’s the state’s reopening
https://chicago.suntimes.com/coronavirus/2021/2/4/21611542/illinois-phase-tier-reopen-coronavirus-covid-pritzker-region-restaurants
webFeb 4, 2021 · After Tier 1, Illinois’ regions reenter the original “phase” system, advancing to Phase 4 and finally, to Phase 5, which marks the end of the public health response. Alternatively, regions can move backwards if their metrics go in the wrong direction. Here’s a basic graphic from the state explaining the progression of the tiers and phases:
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