Assertion: smog's ozone | /r/HasProperty | gas
Facets:
Source sentences:
text: Ozone is a gas created when its building blocks, nitrogen oxides and volatile organic compounds, interact in the atmosphere in the presence of heat and sunlight.
text: Ozone, a gas, is a major part of air pollution in cities.
text: Ozone is a gas composed of three atoms of oxygen (O3).