Pollution
CO2 emissions
CO2 (carbon dioxide) emissions per unit of value added is an indicator computed as ratio between CO2 emissions from fuel combustion and the value added of associated economic activities.
International agreements on pollution
The indicator refers to the number of countries that are signatory of 1 to 5 international multilateral environmental agreements, namely, Minamata, Basel, Rotterdam and Stockholm Conventions and the Montreal Protocol on hazardous waste and other chemicals.
Particle emissions (PM2.5) in cities
This indicator measures the national the national average concentration levels of particulate matter with a diameter of 2.5 microns or smaller (PM2.5) in urban areas (μg/m3), weighted by city population size.
Coastal eutrophication and plastic debris
Indicators 4A index of coastal eutrophication, and 4B plastic debris density, are created to prevent and reduce marine pollution. Coastal eutrophication is the loading of nutrients into coastal environments from anthropogenic sources, resulting directly in an excessive growth of plants, algae and phytoplankton, and indirectly in oxygen depletion. Plastic debris density refers to datasets on plastic litter in the marine environment.
Wastewater safely treated
This indicator measures the share of the total wastewater, generated by households (sewage and faecal sludge) and economic activities (especially hazardous industries), that is safely treated.