In recent years, CSIR-National Physical Laboratory (CSIR-NPL), New Delhi, has been actively engaged in the development, testing, and calibration of several Particulate Matter (PM) technologies. A state-of-the-art facility has been established in the Gas Metrology Section of the Environmental Sciences and Biomedical Metrology Division at CSIR-NPL. This facility provides comprehensive services to Indian manufacturers and industries in related domains, including filter and mask testing, air purifier testing, Beta ray particle monitor calibration, and manual sampler testing and calibration, among others.

In addition to providing technology support to various industries, several PM measurement technologies, including PM?.?, PM??, and cascade impactor samplers — have already been transferred to Indian manufacturers and successfully commercialised, in line with national initiatives such as “Make in India” and “Atmanirbhar Bharat” (Self-Reliant India).

As a further outcome of this facility, a “High-Volume PM? Sampler” technology, indigenously designed and developed at CSIR-NPL, was transferred to the MSME M/s MJ Environmental Solutions LLP, Noida, during the CSIR Foundation Day celebration, which was held on 29 October 2025, at CSIR-NPL.

This technology features a novel design of a PM? impactor sampler, which efficiently segregates particulate matter larger than 1 µm (aerodynamic diameter) and enables the collection of particles ≤ 1 µm in size from ambient air on an 8-inch × 10-inch filter, operating at a high flow rate of 1.13 m³/min (approximately 40 CFM). This marks the first high-volume PM? sampling technology developed in India, representing a significant step toward indigenous capability in advanced air quality monitoring systems.