Precursor Compounds that change chemically or physically after being emitted into the air and eventually produce air pollutants. For example, sulfur and nitrogen oxides are precursors for particulate matter.

The term "precursor" was found in the following pages:

EU approves new selenium compound for use as a nutritional supplement in animals | EVISA's News
Instrument database: Bruker Daltonics - ultraflex II & ultraflex II TOF/TOF
Journals database: Journal of Nanoparticle Research
Instrument database: Thermo Scientific - TSQ Quantum Ultra™ Triple Quadrupole Mass Spectrometer
Triple Quad ICP-MS: Pushing the limits for quantitation of phosphorus and sulfur | EVISA's News
Link database: Australian Government: National Pollutant Inventory: Manganese & compounds
Instrument database: Thermo Scientific - TSQ Quantum XLS Ultra™ GC-MS/MS
Instrument database: Shimadzu Europe - LCMS-IT-TOF™ Mass Spectrometer
Company database: International Society for Preventive Oncology
Instrument database: Waters Corporation - Q-TOF Ultima API
Symposium on Air Quality Measurement Methods and Technology | EVISA's Agenda of Events
Instrument database: Bruker Daltonics - apex-Qe - Qh-FTMS
Instrument database: Shimadzu Europe - AXIMA Resonance - MALDI-TOF Mass Spectrometer
Instrument database: Bruker Daltonics - HCTultra
Arsenic-Containing Phosphatidylcholines Discovered in Herring Caviar | EVISA's News
Instrument database: Applied Biosystems - 4800 MALDI TOF/TOF™ Analyzer
Instrument database: Thermo Scientific - TSQ Quantum Access
Instrument database: Waters Corporation - Quattro micro GC
Selenomethionine shows promising results as a protective agent against Esophageal Cancer | EVISA's News
Instrument database: Shimadzu Europe - MALDI-7090: MALDI TOF-TOF Mass Spectrometer