How Long the COVID Virus Can Live on Surfaces

One of the many important things to know about the particular strain of coronavirus which is the etiological agent of the current pandemic is the length of time the virus can remain infectious when it is in the environment. This exceptionally well written and documented letter was published in the New England journal of Medicine […]
The Difference Between CNC & CNP Fit Testing

Two Quantitative Fit Testing Methods Respirator fit testing is becoming more important all the time. There are currently two commonly-used methods for performing quantitative fit testing: Condensation Nuclei Counting (CNC) and Controlled Negative Pressure (CNP). So, what’s the difference? CNC Fit Testing By far, the most widely used method is the ambient aerosol method using […]