International Standards

United States

The U.S. EPA primary standards for PM₁₀ are:

24 hour average	150µg/std m³
Annual average	50µg/std m³

EPA reference Conditions:
Standard temperature defined as 298K (25°C)
Standard pressure defined as 101.3 kPa (760mm Hg)

The U.S. EPA primary standards for PM2.5 are:

3-year average of 98th percentile of 24 hour average	65µg/std m³
3-year average of annual average mean	15µg/std m³

The total volume of air sampled is determined by the sampler from the measured flow rate at actual ambient temperature and pressure and the sampling time.

Note: The U.S. EPA reference method for PM_2.5 is the method specified in the U.S. EPA Code of Federal Regulations 40 Part 50 Appendix L; Federal Reference Method for the Determination of Fine Particulate Matter as PM_2.5 in the Atmosphere.

Australia - High Volume PM₁₀

The Australian National Environmental Protection Council has established the following objectives for Particles as PM10:

24 hour average

Maximum concentration:	50µg/std m³
Maximum allowable excedances:	5 days per year

Australian reference conditions:
Standard temperature defined as 273K (0°C)
Standard pressure defined as 101.3 kPa (760mm Hg)

Dust Samplers

Monitoring particulates and dust