SO2 and NOx emissions contribute to atmospheric sulfate and nitrate concentrations that cause visibility impairment, including impairment in many national parks and wilderness areas.
SO2 and NOx emissions have no impact on visibility.
mnli hypothesis: SO2 and NOx emissions have no impact on visibility. premise: SO2 and NOx emissions contribute to atmospheric sulfate and nitrate concentrations that cause visibility impairment, including impairment in many national parks and wilderness areas.