Their name comes from the acronym for High Efficiency Particular Air, and it is a quality and efficiency standard for air filters. It guarantees that such filters capture 99.97% of polluting particles. They were created in the United States during World War II to protect engineers working in the toxic environments in which the first atomic bombs were created. Today, we can find HEPA filters in the most demanding industries, such as pharmaceuticals and aerospace. Also in hospitals, homes, wellness, and sports centers.