Graphical techniques

During the past decades the IB has used the same graph several times as the basis of a question. The latest is in the specimen papers for the new programme. The graph used is:It is an interesting graph because it shows how primary pollutants build up during the morning rush hour periods and then the secondary pollutants, PAN (peroxyacylnitrates), increase during sunlight hours as the nitrogen oxides undergo photochemical...

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