title: II.6.a General aspects.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis; D004787:Environmental Pollution; D009602:Nitrosamines / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D004785:Environmental Pollutants; D009602:Nitrosamines