It's important to keep separate issues separate. Urban pollution is one problem, global climate change is a different one.
Indeed a complex aspect of the relationship is that SO2 emissions, which are a nasty local pollutant, harmful to health and to plants, have been dramatically reduced by legislation saving many lives, but SO2 emissions have the opposite effect as CO2 on global temperatures (pumping SO2 into the stratosphere has even been seriously proposed as a way to reduce global warming). This may be part of the reason global temperatures paused for quite a while in the 20th Century before sulphur emissions legislation kicked in and the effect of the CO2 was unfettered.
There is currently a relatively modern problem with SO2 pollution in Asia, because they burn a lot of coal. Their (local) environmental standards will improve too, but whether global warming will accelerate as a result depends on how CO2 emissions change in the same period. All we can be sure is that since the 50s, CO2 has dominated any effect of SO2.
That's better: quite funny, that one! The first one looked too serious.