Air and water from Carole Paquette – this powerpoint covers most of what you need to know (it just misses out some of the effects of carbon dioxide as a pollutant).
TEXTBOOK REVISION
Complete Chemistry for Cambridge IGCSE, chapter 15, pp.210 – 219 & chapter 16, pp.226 – 228, pp.234 – 235 & 238 – 239 (and p.124 for water tests)
Here are some key terms for this topic: Key Terms C11