People dine out in Chicago on June 1, 2021. (WTTW News)

How do you ask someone to put on a face mask? And how do you tell them if they’re wearing it incorrectly? We asked a trio of experts for advice.

A bartender mixes a drink at the Chicago restaurant 14 Parish. (WTTW News)
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Everyone in Chicago, regardless of their vaccination status, must wear a mask indoors starting Friday, Chicago’s top doctor announced Tuesday. The mandate comes amid the city’s fourth surge in COVID-19 infections, driven by the more transmissible delta variant.

Hy Vee pharmacist Tiffany Aljets fills a syringe for a COVID-19 vaccination, Monday, Aug. 16, 2021, in Des Moines, Iowa. (AP Photo / Charlie Neibergall)
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State fairs in Illinois, Indiana, Minnesota and Wisconsin also are offering COVID-19 vaccinations as the delta variant spreads nationwide and relaxed masking leaves some public health officials concerned about another surge in infections.

Students sit masked and socially distanced in a CPS classroom. (WTTW News)
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Students and teachers at Chicago Public Schools head back to the classroom this month. We speak with the district’s interim CEO and an official from the health department about returning to school as COVID-19 cases rise.

A young student wears a mask while working on a laptop. (WTTW News)

Masks must be worn in Illinois schools when students and staff return to the classroom in the coming weeks. But a just-filed lawsuit could void that statewide executive order. We talk with the attorney who filed it — and a local pediatrician. 

Gov. J.B. Pritzker announced a mask mandate for all pre-K through 12th grade students and staff at public and private schools, along with day cares, as the delta variant of COVID-19 continues to surge across the state and the country, Aug. 4, 2021. (WTTW News)

The governor institutes a full pre-K through 12 mask mandate. The city’s casino process gets delayed. The governor’s race could get a new entrant. And fire sale Cubs take on the surging Sox.

In this file photo, restaurant patrons wear masks while dining indoors. (WTTW News)
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Masking will be universally required in Illinois schools, and some state employees must get vaccinated for the coronavirus, according to mandates handed down Wednesday by Gov. J.B. Pritzker — a move that immediately drew rebuke from friends and foes alike.

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With classes for students in pre-K through 12th grade set to resume across Illinois in the coming weeks, Gov. J.B. Pritzker on Wednesday announced a mask mandate for all students and staff at public and private schools.

Fears spike that Lollapalooza will be a super-spreader event, with thousands of locals and tourists attending amid surging delta variant cases. (WTTW News)

Fears spike that Lollapalooza will be a super-spreader event, with thousands of locals and tourists attending amid surging delta variant cases. Meanwhile, masking mandates make a comeback. Illinois Republicans battle each other over the Jan. 6 committee hearings. And the Cubs shed their World Series stars.

In this file photo, restaurant patrons wear masks while dining indoors. (WTTW News)

Everyone in Chicago, regardless of their vaccination status should wear a mask indoors, Chicago health officials recommended Friday after the Centers for Disease Control and Prevention added Chicago to its list of areas experiencing “substantial” transmission of the coronavirus.

In this file photo, restaurant patrons wear masks while dining indoors. (WTTW News)

Consider wearing a mask indoors, even if you’re fully vaccinated. That’s the newest recommendation from the Centers for Disease Control and Prevention, and some experts say they expect mask mandates, not just recommendations, to return in Chicago and elsewhere.

(AP Illustration / Peter Hamlin)

In places where the virus is surging, the U.S. Centers for Disease Control and Prevention recommends that vaccinated people return to wearing masks in public indoor places.

People wearing masks line up for a food drive in Brighton Park on Chicago’s Southwest Side on April 23, 2020. (WTTW News)

Echoing a masking announcement from the Centers for Disease Control and Prevention, Illinois health officials are recommending that everyone, regardless of vaccination status, wear masks indoors in school settings and in areas where COVID-19 is spreading.

In this Friday, March 5, 2021 file photo, a restaurant worker holds his face mask in Biloxi, Miss. (AP Photo / Rogelio V. Solis)

The Centers for Disease Control and Prevention changed course Tuesday on some masking guidelines, recommending that even vaccinated people return to wearing masks indoors in parts of the U.S. where the delta variant of the coronavirus is fueling infection surges.

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Chicago Public Schools students and staff must continue wearing masks inside facilities and maintain 3 feet of social distancing where possible when in-person learning resumes at the end of August.

FILE - In this March 2, 2021 file photo, a student plays the flute while wearing a protective face mask during a music class at the Sinaloa Middle School in Novato, Calif. (AP Photo / Haven Daily)
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With COVID-19 cases soaring nationwide, school districts across the U.S. are yet again confronting the realities of a polarized country and the lingering pandemic as they navigate mask requirements, vaccine rules and social distancing requirements for the fast-approaching new school year.