Sulfur emissions.
D000393:Air Pollutants; D009589:Nitrogen Oxides / Q000009:adverse effects; D013458:Sulfur Dioxide / Q000009:adverse effects*; D013461:Sulfur Oxides / Q000009:adverse effects
D000393:Air Pollutants; D009589:Nitrogen Oxides; D013461:Sulfur Oxides; D013458:Sulfur Dioxide