Applications Ambient PM1 sampling Indoor Air Quality sampling Speciation sampling PM1 "Type 3" sampling Features Dry sampling Atmospheric and chemically inert clear anodize finish on aluminum alloy Field cleanable

The Sharp Cut Cyclone (SCC) for EPA type PM2.5 sampling was developed and tested for non-EPA designated sampling applications wherein dry sampling is imperative (speciation) or long intervals without cleaning were essential (continuous monitoring). The details and references pertaining to this development are presented on the PM2.5 Sharp Cut Cyclone page of this website.

PM1 sampling has no official status at this time. However, there are reasons why this further development of the SCC family was carried out.

A recent paper by C. Sioutas et al (1999) on the development of the personal PM1 sampler acknowledged that the work was carried out under an EPA subcontract, thus indicating a glimmering of interest.

Note has recently been taken of the finding that, in many areas wherein PM10 and PM2.5 sampling is co-located there is little or no difference between the two concentrations. This clearly indicates that there is no coarse fraction and everything is below PM2.5. The ability to measure PM1 offers an opportunity to discern what "lies below", and will offer a valuable tool for investigative health effect studies.

Utilizing techniques developed by Kenny et al (1997) which led to the development of the PM2.5 SCC and reported by Kenny et al (2000), further research was carried out to develop a PM1 SCC. Using the SCC model, a new design was constructed and tested for size selectivity (Gussman, 2000). The cyclone that evolved has a slightly shaper cut than the PM2.5 model.

The unit is available as a research tool and has not been the subject of loading or ambient studies.