Model: 2097 (pair)The 3M 2097 P100 (HEPA) Particulate Filter with Nuisance Level Organic Vapor Relief and Ozone Protection. Use this filter for protection against toxic dusts such as lead and asbestos, and for mold cleanup and remediation. If you're working around mold or if you are arc welding, then we would suggest using the 3M 2097 Filter. Active mold growth produces Volatile Organic Compounds (VOCs) that won't be absorbed by a lesser filter. Arc welding produces ozone, which also won't be absorbed by a lesser filter.