Micro is big. Talk nano
with growing awareness of the detrimental effects of particulate matter on human health and environment, international research forums are faced with a number of concerns. One of the most important is to determine the size of particulate matter that has the most harmful effects on human health. Only this can determine the size of particles to be monitored on priority.
Recent research has revealed that as the size of the particle decreases, its lethal effect on human health increases. According to M G Constantini of Health Effects Institute in Massachusetts, usa , penetration and deposition of particulate matter in the lungs depends on the size of the particle. That is, the smaller the particle, the greater its ability to penetrate the lungs.
Moreover, the cells of our lungs react first with the components on the surface of the particles. This makes the ultrafine particles (smaller than 0.1 micron in size) more dangerous as they have a larger surface area where they adsorb a greater amount of toxic chemicals than the larger particles. One micron (