This metric estimates the amount of carbon dioxide absorbed from the atmosphere annually. The value of 21.8 kg is a widely used average for the annual sequestration rate of a mature tree, derived from forestry research.

This is a relative score indicating the complexity of the habitat. A higher variety of species in a given area generally supports a richer ecosystem. This index provides a simple measure of this potential.

This estimates the potential reduction in local ambient air temperature. Urban green spaces can lower temperatures by 0.7°C to 1.3°C compared to open areas. This formula uses a conservative estimate based on an average reduction of 0.2°C per 100 m² of canopy cover.

This calculates the estimated annual removal of harmful fine particulate matter (PM2.5) from the air. Large, healthy trees can remove significantly more pollution than smaller trees; this formula uses a conservative average based on urban forestry studies.

This metric estimates the volume of rainwater intercepted by vegetation, which reduces the load on drainage systems. The value is based on an average interception rate of 100 litres per square meter of green space, derived from hydrological models.

Equivalent number of average petrol cars' annual CO₂ emissions avoided.
Formula: CO₂_sequestered_kg ÷ 1710 (kg CO₂ per car-year)

Equivalent to the annual electricity use of average households offset by saved emissions.
Formula: CO₂_sequestered_kg ÷ 3000 (kg CO₂ per household-year)

Approximate number of 1-tonne CO₂ credits represented.
Formula: CO₂_sequestered_kg ÷ 1000