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PM2.5 Fine particulate matter SPM Suspended particulate matter
NOx Nitrogen oxide
SO2 Diacid sulphur
O3 Ozone
CO Carbon monoxide
NMHC Non-methane hydrocarbon

The global destruction of nature such as acid rain, ozone depletion, forest death, photochemical air pollution, heat island phenomenon, etc., is progressing and worrying all humankind.
DKK-TOA Corporation holds the global environmental protection and enriched future for all humans as our company philosophy and have gained trust as an ambient air measurement professional through our history, records and service provision.
In order to maintain the beautiful earth for the future generations, we will continue to endeavor to develop advanced technologies as a leading manufacturer of ambient air analyzers.