Course Introduction This course covers Air Quality  This course aims to answer several questions, including: 1 Which chemicals make up air, and which ones are pollutants? How do I make sense of data about air pollution? 2 What chemical reactions produce air pollutants? What happens to these pollutants in the atmosphere? 3 What choices can we make personally, locally, nationally or globally to improve air quality? The following information, included in this course, is covered at Higher Tier only: Nitrogen monoxide NO is formed during the combustion of fuels in air, and is subsequently oxidised to nitrogen dioxide  Wet scrubbing Benefits and problems of using alternatives to fossil fuels for motor vehicles