Vasthi Instruments is the leading manufacturer of NOx analyzers (CAAQMS) in India. The analyzer uses the chemiluminescence detection principle for accurate monitoring of NOx levels in the air.Ambient NOx gas analyzer Vair-9002 NOx Analyzer is the analyzer that measures the minimum amount of NOx(NO, NO2) in the air at the same time using Chemiluminescence.03 Generator used for Vair-9002 is designed for strong durability with no failure for a long time and the NO2 —NO Converter for measurement of NO2 is equipped with highly efficient cartridge material which improves the change rate near 100%.