VASTHI INSTRUMENTS is one of the leading manufacturers and service providers of all types of portable and gas stack gas analyzers, gas detectors, VOC analyzers, dew point meters, hydrogen purity meters, dust monitors, flue gas analyzers, AAQMS (PM10, PM2.5), continuous stack emission monitoring systems, and a wide range of water analyzers. Vasthi PM Ten and PM Two Point Five are two common terms used in the field of air quality monitoring. They refer to particulate matter (PM) with diameters of ten micrometers (um) or less and two points five micrometers or less, respectively. PM ten and PM two-point five are considered significant air pollutants due to their ability to penetrate the respiratory system and potentially cause adverse health effects.