EPA 40 CFR Part 50 – Product & Materials Guide

National Ambient Air Quality Standards for Fine Particulate Matter

EPA 40 CFR Part 50 provides sampling methods and acceptable concentration limits for particle contamination in ambient air. This gravimetric method is used to determine the mass concentration of particles with a diameter less than or equal to 2.5 μm (PM2.5). Samples are collected over a specified amount of time by drawing air into an inertial particle size separator (impactor) at a constant flow rate. After separation, particles in the PM2.5 size range (≤2.5 μm) are the collected on the membrane filter. Membrane selection is based on geography and governing regulating bodies; options include polytetrafluoroethylene (PTFE), glass fiber, or quartz filters. The mass concentration is derived by dividing the total mass of particles collected by the volume of air sampled, and is expressed in micrograms per cubic meter of air (µg/m3). Our product portfolio contains all the Millipore® filtration products you need for particle monitoring, regardless of your method or application.

Analysis Method: Gravimetric

Learn more about the EPA 40 CFR Part 50 Method

Materials needed for EPA 40 CFR Part 50

  • Certified PTFE filters validated to match USEPA method requirements. Some geographies allow the use of glass fiber or quartz membrane filters for analysis.
  • Forceps to handle filter membrane

Products for EPA 40 CFR Part 50

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