Districts without mask requirements are experiencing higher case rates

  • 5-18 year old school population case rates are higher and rose faster in districts without mask requirements
  • Districts with complete or partial mask requirements have lower case rates with slower increases
  • Note districts may change categories as mask rules change
  • Districts with mask rules may also have other prevention measures that can contribute to lower transmission levels

High mask index = mask required for all grades;

Medium = partial mask req. (tiered, some grades, based on vax status, staff only);

Low = None or unknown.

Blue line & shaded region = linear trend fit.

Data Sources: MDSS/MDHHS; Case data as of 10/6/2021; Geocoded to schoool district, EOG School District Mask Policy Tracker data. Note: Cases are among all 5-18 year olds, population is the school-enrolled population.

​Wear a Mask

Masks are an additional step to help prevent people from getting and spreading COVID-19. They provide a barrier that keeps respiratory droplets from spreading. Wear a mask and take every day preventive actions in public settings if you:

  • Are over 2 years of age and are not fully vaccinated
  • Are vaccinated or unvaccinated and in an area of substantial or high transmission
  • Have a weakened immune system
  • Are required by laws, rules, regulations, or local guidance

Masks are still required on planes, buses, trains, and other forms of public transportation traveling into, within, or out of the United States and in U.S. transportation hubs such as airports and stations.

For optimal protection, CDC recommends choosing a mask that fits snugly against your face, has at least two layers, and completely covers your nose and mouth. 


Masks should:

  • Completely cover the nose and mouth
  • Fit snugly against the sides of the face and not have any gaps
  • Be handled only by the ear loops, cords, or head straps (not by the surface of the mask)

If you are unvaccinated, your mask should be worn:

  • Any time you are in an indoor public setting
  • Any time you are traveling on a plane, bus, train, or other form of public transportation traveling into, within, or out of the United States and in U.S. transportation hubs such as airports and stations
  • When you are around people who do not live with you, including inside your home or inside someone else's home
  • Inside your home if someone you live with is sick with symptoms of COVID-19 or has tested positive for COVID-19

If you are fully vaccinated (2 weeks after the second dose in a 2-dose series, such as the Pfizer or Moderna vaccines, or 2 weeks after a single-dose vaccine, such as Johnson & Johnson's Janssen vaccine): 

Masks should not be worn:

  • By a child under 2 years of age
  • By someone with a disability who cannot wear a mask, or cannot safely wear a mask, for reasons related to the disability
  • In a situation when wearing a mask would create a risk to workplace health, safety, or job duty as determined by the workplace risk assessment

For more information

If you have Asthma