New research from UCLA shows climate change-induced heat waves pose a growing threat to workers.
There are still no emergency COVID standards from OSHA for other industries like meatpacking and farming.
The agency did not set safety rules for COVID-19 under the previous administration.
Until now such decisions have been left to states, leading to wide variation and confusion.
The order also asks OSHA to strengthen its workplace enforcement efforts.
OSHA has declined to create national rules during the pandemic.
A recent survey from Korn Ferry found that 47% of retailers are having a hard time finding seasonal workers this year.
The Occupational Safety and Health Administration says it has received more than 10,000 COVID-related complaints.
Nationally, there is no requirement to do so.