4.11

+ Sulphur dioxide – SO^2 gas, Is added to the atmosphere when we have the combustion of fossil fuels in factories or vehicles, in atmosphere it combines with water vapour and forms sulphuric acid can be found  in clouds and when it rains it is called “acid rain” -> affects plants and animals

+Trees and plants are often burned by the direct sulphuric acid also sulphuric acid could be soaked up by the roots. Ca2+ and mg2+ then cannot be obtained by the root

+Acid rain in lakes and streams harms fish gills by thickening mucus from AL3+ O2 from H2O is reduced

+ Carbon Monoxide – produced when fossil fuels such as coal and gas are burned with insufficient oxygen.

+CO-> combines with haemoglobin in RBC forms carbamino haemoglobin the problem is that it blocks haemoglobin from carrying oxygen so therefore reducing oxygen circulation = toxic and too much can cause death