But ground - level ozone — the chemical combustion product of factory and vehicle emissions heated by sunlight — can have a devastating effect. (discovermagazine.com)
Coal combustion products are expected to continue to play a major role in the concrete market. (worldcoal.org)
The leading hypothesis is that this dimming is from combustion products including sulfates and particulate matter, though at this point this is more of a hypothesis than demonstrated cause and effect. (climate-skeptic.com)