Filter — Nuisance Level. PAPR P3 Filter with nuisance level organic vapour relief. Nuisance level refers to concentrations below applicable occupational exposure limits. Ideal for use with dealing with dusts, mists, fumes and aerosols produced in the workplace, which can be injurious to the lungs. Suitable for providing respiratory protection from particles in most workplace situations such as manufacturing, pharmaceuticals, food processing and welding with suitable welding shield.