The Unpriced Burden: Heavy Vehicle Emissions and Australia's $6.2 Billion Health Cost
Researchers applied a more rigorous methodology to quantify a cost that has often been excluded from freight policy: the health burden of heavy vehicle exhaust emissions.
Australian policy has historically relied on methods that understate the health impacts of vehicle emissions. The cost-benefit analysis informing the 2024 federal vehicle emissions reforms used legacy air pollution damage values and international transfer assumptions without providing an updated, comprehensive national estimate.
By comparison, New Zealand, with just one-fifth Australia’s population and lower urbanisation, estimates that vehicle emissions cause 2,200 premature deaths each year at a cost of NZ$10.5 billion (A$8.7–9.0 billion). The gap between New Zealand’s evidence-based, population- and location-specific figures and Australia’s extrapolated estimates is implausible and highlights how far Australian transport policy lags in capturing the true health impacts.
This paper addresses three methodological problems:
The wrong indicator: The most cited existing analysis for Australia relies on PM2.5. Evidence indicates that relying solely on PM2.5 may underestimate traffic-related mortality by up to 90%. This paper uses nitrogen dioxide (NO2), a better indicator of traffic exhaust.
Risk estimates from the wrong settings: International meta-analyses are dominated by studies from more polluted countries. At Australia’s lower pollution levels, the dose-response relationship is supra-linear: each unit causes proportionally greater harm.
No Australian-specific data: This paper draws on low-pollution cohorts (European ELAPSE, NZ HAPINZ 3.0) and the first peer-reviewed Australian data on cardio-respiratory hospitalisations.
