With the 2021 season Illinois High School Athletics (IHSA) track and field events will be conducted using metric units only. Since 1980 dual units have been used. The change to metric-only was supposed to take place for the 2020 season, but was postponed one year because of the coronavirus. Illinois, the fifth most populous state, thus joins Florida, the third most populous state, in using metric units only. Other states are expected to move to metric-only soon.
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