Monitoring fine particle concentrations

A robust and versatile system has been developed by Pegasor Oy to measure engine exhaust particulate mass and number more accurately.

Fine particles are released into the atmosphere from several sources-such as vehicles, industries, etc.-in variable concentrations and a range of particle sizes from greater than 10 μm to less than 5 nm. It has been shown that the most harmful particles are those smaller than 2.5 μm, which cannot be effectively removed by the body's defense mechanisms in the upper respiratory tract. The smallest of these particles, those below 100 nm, have been proven to easily penetrate not only the upper respiratory system but also the lining of the lungs, cell interstitium, and cell walls. Exposure (either short or long term) can cause a variety of acute and chronic health issues ranging from asthma to heart attacks, strokes, and premature deaths.

These tiny particles are also the most difficult to measure. Currently they are measured with costly, complex, and delicate equipment that requires frequent service and extensive training to operate, and none have been able to be used continuously in field conditions or as part of a permanent installation. The ability of public agencies to mitigate this threat to human health hinges on finding a reliable, accurate, cost-effective method of measuring fine particle pollution.