![]() There are some very inexpensive particle sensors, such as Shinyeis, but reports are that they are not always accurate. These monitors are both accurate and pretty expensive. Or some indoor sources like candles and cooking. Our bench instruments, used in the Boston area by Tufts and community partners like Somerville Transportation Equity Partnership (STEP) both in stationary boxes and in mobile labs, generally count between 10,000 and 50,000 UFP per cubic centimeter but sometimes more, depending on meteorology and proximity to sources, especially mobile sources like highways, rail and aviation. Ultimately it would be most helpful to have relatively inexpensive ultrafine particle (UFP) sensors that could count particles per cubic centimeter in the 5 nm to 100 nm size range. Dylos also makes some pretty well-regarded instruments that measure pretty small airborne particles. They presented their initial ideas for this at an EPA community sensor conference in RTP NC several years ago. And Weather Underground is a great idea for a host network. Hi Jeff - My guess is that if Weather Underground and EPA and CARB have been involved the product is probably pretty good. For more information, go to the World Health Organization (WHO) website.Wig Zamore also chimed in on the mailing list:
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