While the spec sheet does say that, it's not actually true. The PMS5003 is a truncated nephelometer (https://amt.copernicus.org/articles/15/655/2022/) that measures the total scattered light from all particles with diameters less than ~1 µm. This single scalar value (proportional to the total scattered light, as collected across a wide viewing range) is then correlated to a reference measurement of PM2.5 and typically correlates quite well in most urban areas where PM2.5 and PM1 are highly correlated. For more info on the difference between particle counters and nephelometers in this context, see https://amt.copernicus.org/articles/13/6343/2020/.
QuantAQ builds IoT Air Quality sensors and associated cloud platform to run large networks of distributed sensors to generate actionable air quality data. We sell mostly to governments and industry (Mining, construction, transportation, etc). We spun out of a PhD at MIT 4 years ago, have a ton of traction, and are actually building unique hardware than combines some neat physics with ML/AI. We are based out of Greentown Labs in the Boston area and the hardware position is in-person (other positions are hybrid or remote).
We are currently looking for an IoT engineer (Electrical/Mechanical) and will have a few more jobs up soon for Software and Data Science. Feel free to drop a message to david.hagan@quant-aq.com with any questions.
