Depending on the specific situation, traffic police officers on duty on roads in hazy days or law enforcement officers of the food and drug supervision department should be able to wear masks when enforcing laws in harsh environments. It is recommended to use Proweixin from Tianmiu, which meets the highest standards for medical masks in the United States. It has good filtration performance and prevents not only particles but also droplets. The filtration efficiency for particles as small as 0.1 microns is 99.8%, and the filtration efficiency for bacteria or viral vectors (common in droplets) as small as 0.3 microns is 99.9%. Using SecureFit patented technology, it can be adjusted to adapt to different face shapes to achieve a high fit.