You don't have to read the whole report, just search for how it uses the words "greenhouse gases" and "air pollution." The IPCC treats those as being two distinct things.

For example, on p. 55.

> "Consequences of CO2 enrichment and climate change for natural terrestrial ecosystems could be modified by other environmental factors, both natural and man induced (e.g. by air pollution)"

That clearly refers to "air pollution" as an example of "other environmental factors"--something different from "CO2 enrichment" (rising CO2 levels). The report uses the same terminology on pp. 88 and 97. Throughout the report, it treats "greenhouse gasses" as it's own category that can interact with "air pollution"--but is different from air pollution.