Anchor: SO2 and NOx emissions contribute to atmospheric sulfate and nitrate concentrations that cause visibility impairment, including impairment in many national parks and wilderness areas.
Entailed: SO2 and NOx emissions contribute to the problems in the atmosphere.
Contradiction: SO2 and NOx emissions have no impact on visibility.
Contradiction: A man sitting at the top of a mountain.
Contradiction: People holding hands near a window.
Contradiction: The men are sitting down.
Contradiction: A brown dog is sitting outside.