Читать книгу Introduction to Nanoscience and Nanotechnology - Chris Binns - Страница 33

There are identifiable harmful effects on health from exposure to nanoparticles, especially cardiovascular problems associated with inhaled airborne particles and various guidelines for limits of acceptable particulate densities have been published, for example, in the European Directive on air quality [14]. Current air policies on dust levels only distinguish particle sizes in a broad‐brush manner and focus on all particles smaller than 10 μm (the PM₁₀ fraction) and those smaller than 2.5 μm (the PM_2.5 fraction). It is clear from the previous discussion that in the future there will need to be further limits set at PM_0.1 and PM_0.05 (particles smaller than 50 nm).