... when I go on my geography trip. This is not an ideal situation however these survey points are wide ranged and have a variety of different surroundings so they should give me a wide range of results. The theoretical ideal situation would be to use a random number generator which would give 60 points on a map creating a sample which was random. However this would result in a problem as the random generator would quite often give me a co-ordinate that is inaccessible. Even though my data is not random I am collecting primary data. I believe collecting data from different heights will change the temperature as well as the humidity so I will record at different heights around Cambridge; this is because every 10 metres climbed the temperature drops by 1%. Pedestrian density may also affect the results due to respiration; this will make the data more biased. Cars ...

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