Wearing masks

Why

Masks are a normal courtesy when you're sick, and common on high fine-dust days.

Do

• Wear one if you have a cold, especially on public transport.
• Check the fine-dust forecast on bad-air days.

Avoid

• Don't cough or sneeze into the open air.
• Don't comment on someone else's mask.

Useful sentence

감기 기운이 있어서 마스크 썼어요.gamgi giuni isseoseo maseukeu sseosseoyo.I've got a bit of a cold, so I'm wearing a mask.

These are general customs; people, generations and situations vary — kindness covers most mistakes.