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Metlink is committed to delivering an environmentally friendly bus fleet across the region by reducing emissions of greenhouse gases and harmful air pollutants from  buses whilst increasing patronage.

This report summarises trends in greenhouse gas (CO2 equivalents) and harmful pollutant emissions (NOx and particulate matter) from the bus fleet from August 2018 to June 2026. Emissions were calculated using the Metlink data warehouse which tracks all bus trips.

Air quality monitoring trends along the bus corridor through Wellington’s Golden Mile are also presented.