Definition 1
Air Quality means the condition of air in and around a given location measured by concentrations of specific pollutants, in particular the extent to which it is clean, clear and free from pollutants including, but not limited to, particulate matter (PM2.5, PM10), nitrogen oxides (NOx), sulfur dioxide (SO2), ozone (O3), carbon monoxide (CO), smog, smoke, industrial gases and dust as measured against applicable air quality standards or indices.
Drafting notes and guidance
Global differences in measuring air quality
Globally, air quality is measured and forecast empirically using air quality standards and indices which vary by country. These indices correlate measured pollutant concentrations with health impact studies and epidemiological data to establish concentration thresholds associated with health effects.
Parties should also consider how and which different air quality standards may apply at a local, national and/or international level.