The purpose of this testing is to establish the following understandings:

1. The testing protocol meets an accepted repeatability vs known methodology (gravimetric/XRD analysis) over numerous tests.
2. The XD1+ monitor demonstrates consistent results under the same conditions.
3. Under controlled conditions XD1+ meets the standards set out in the manufacturer’s information.
4. Confidence in the average measurement despite inherent variability in the characteristics of particulate including but not limited
5. to size distribution compound composition.
6. To provide information relevant to use applications to allow users to make considered decisions based on a local environment.