Assertion: photochemical smog | /r/HasProperty | unique type of air pollution
Facets:
Source sentences:
text: Photochemical smog is a unique type of air pollution which is caused by reactions between sunlight and pollutants like hydrocarbons and nitrogen dioxide.
text: Photochemical smog is a unique type of air pollution which is caused by reactions between sunlight and pollutants like hydrocarbons and nitrogen dioxide.