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Air-pollution emission ranges consistent with the representative concentration pathways


The fifth phase of the Coupled Model Intercomparison Project1 uses four representative concentration pathways2 (RCPs) that span the literature range of total anthropogenic radiative forcing2,3 but not necessarily of each single forcing agent. We here explore a wide range of air-pollutant emissions over the twenty-first century consistent with the global CO2 paths of the RCPs, by varying assumptions on air-pollution controls and accounting for the possible phase-out of CO2-emitting sources. We show that global air-pollutant emissions in the RCPs (including ozone and aerosol precursors) compare well to and are at times higher than cases that assume an extrapolation of current and planned air-pollution legislation in the absence of new policies to improve energy access for the poor. Stringent pollution controls and clean energy policies can thus further reduce the global atmospheric air-pollution loading below the RCP levels. When assuming pollution control frozen at 2005 levels, the RCP8.5-consistent loading of all species either stabilizes or increases during the twenty-first century, in contrast to RCP4.5 and RCP2.6, which see a consistent decrease in the long term. Our results inform the possible range of global aerosol loading. However, the net aerosol forcing depends strongly on the geographical location of emissions4. Therefore, a regional perspective is required to further explore the range of compatible forcing projections.

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Figure 1: Ranges of anthropogenic air-pollutant emissions consistent with the representative concentration pathways (RCPs).
Figure 2: Influence of energy access policies on air pollutants from the residential and commercial sector.

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J.R. was supported by the Swiss National Science Foundation (project 200021-135067).

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J.R. and K.R. designed the research; J.R. carried out the research, using air-pollution policy variants from S.R. and scenario data from D.L.M.; J.R. wrote the first draft; all authors contributed to the analysis and discussion of the results, as well as to writing the paper.

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Correspondence to Joeri Rogelj.

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The authors declare no competing financial interests.

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Rogelj, J., Rao, S., McCollum, D. et al. Air-pollution emission ranges consistent with the representative concentration pathways. Nature Clim Change 4, 446–450 (2014).

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