**Face masks and respirators** are core personal respiratory protective products. Their primary function is to create a **filtering barrier** for the wearer, effectively blocking airborne particles (such as dust, droplets, pathogens), harmful aerosols, and some odors to protect respiratory health. **Main applications include:** 1. **Medical Protection**: Surgical masks and N95/KN95 respirators, used by healthcare workers and the public for disease prevention. 2. **Industrial Protection**: Dust masks and gas masks, used in industries such as mining, chemical, and construction for occupational health. 3. **Daily Protection**: Anti-smog masks and antibacterial masks, used to address air pollution, pollen allergies, and public space protection. 4. **Special Scenarios**: Sports masks, cold-weather masks, and children's masks, designed for specific environments and user groups. By utilizing different materials (e.g., meltblown fabric, electret cotton) and structural designs, masks balance **protection, breathability, and comfort**, serving as essential equipment for public health and occupational safety.