Vasthi providing best PM10 and PM2.5 CAAQMS are terms used to describe particulate matter in the air, distinguished by their size. PM10 refers to particles with a diameter of 10 micrometres or smaller, while PM2.5 consists of even finer particles, measuring 2.5 micrometres or less. These particles can originate from various sources, including vehicle emissions, industrial processes, ... https://vasthi.com/product/22/pm10-and-pm2.5-caaqms