Q: When should people wear masks? | 人們何時應該佩戴口罩？A: Masks are recommended during high pollution days, active respiratory illness outbreaks (flu, COVID), in crowded healthcare settings, and for immunocompromised individuals. Proper mask fit and type matter significantly. Disposable masks provide basic protection; N95 masks offer higher protection in high-risk situations.建議在高污染日期、活躍的呼吸道疾病爆發期間（流感、COVID）、擁擠的醫療保健場所以及對於免疫力低下的個人佩戴口罩。適當的口罩貼合和類型非常重要。一次性口罩提供基本保護；N95口罩在高風險情況下提供更高的保護。
Q: What's the difference between mask types? | 口罩類型有什麼區別？A: Surgical masks protect others primarily; N95/KN95 masks protect the wearer from inhalation of particles and pathogens. Cloth masks offer minimal protection. Proper fit is crucial - masks must seal around nose and mouth to be effective.外科口罩主要保護他人；N95/KN95口罩保護佩戴者免受顆粒物和病原體的吸入。布料口罩提供最少的保護。適當的貼合至關重要 - 口罩必須密封在鼻子和嘴巴周圍才能有效。
