Department of Environmental Protection


Air Quality, Energy & Sustainability

Division of Air Quality — Air Monitoring

GLOSSARY OF ABBREVIATIONS & TERMS * highlight indicates a criteria pollutant

Air Quality Index (AQI)

a national rating system for reporting daily air quality to the public based on National Ambient Air Quality Standards (NAAQS)

Air toxics

– air pollutants that may cause adverse health effects in humans, but do not have a National Ambient Air Quality Standards (NAAQS)

Ambient air

– air in outdoor areas that are accessible to the general public


– NJDEP Bureau of Air Monitoring


– a network of real-time cameras established to raise public awareness of the effects of air pollution on visibility.

Ozone precursors

– a group of volatile organic compounds (VOCs) that affect ozone formation and destruction in the atmosphere; also called PAMS pollutants.


- Photochemical Assessment Monitoring Stations program, which measures ozone precursors

Particulate matter

– a complex mix of liquid and/or solid particles in the atmosphere


– Lead, a criteria pollutant and a HAP


– Fine particles, 2.5 micrometers in aerodynamic diameter or smaller; a criteria pollutant

PM2.5 - Speciation

Speciation – a group of elements, ionic compounds and carbon compounds that are analyzed from fine particles.

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