What is an "essential industry" or "frontline worker"?

Using guidance from the federal government, in Executive Orders 2020-21 and 2020-70, Governor Whitmer identified workers, and the fields they work in, in Michigan as essential to keeping our state running. Frontline workers are those who worked in these essential industries in a job that required them to work at least some of the time outside of their home during the COVID-19 emergency this spring. Some examples of these frontline workers are those who staffed our grocery stores and restaurants, provided waste management services, manufactured Personal Protective Equipment (PPE), operated public transportation, or provided critical police or fire services.