The orange circles could represent areas that need improvement in cleanliness. The larger circles could resemble places where there is a lot of rubbish, while smaller circles resemble less. In terms of the purple lines, these annotations could resemble movement. The closer the lines are together the more movement there is, the darker lines resembling motored movement, while the lighter purple resembles organic movement. For the green lines I would suggest that the darker more solid lines represent some kind of wind flow such as areas that are more windy. Finally the black lines could resemble, pollution rather than traffic flow, as this is a byproduct of the traffic on the roads.
The images below are of the map after being redrawn to represent the information more directly. This has also been influenced by some of the other interpretations I made above. The first image shows the notations with the original base map of the area, while the second is without this to remove the traditional reference points, and demonstrate the patterns and properties of the annotations. To see larger versions of these images click on them:
In terms of the key for this map the elements work as follows:

This therefore demonstrates the careful consideration of how the map should be redesigned to better connotate the elements it represents, as well as improving the general look of the image.
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