Uploaded on 2014-11-15 by pratas86

[1]: https://edxuploads.s3.amazonaws.com/14160750458227394.jpg 1 - This is a photo from a roundabout in the city of Aveiro, near the Santa Joana Avenue. In the photo we can see road traffic, road signs, trees, buildings being faced by the setting sun. This picture was taken in a sunday afternoon and because of that the traffic was actually quite calm. The city has a nice level of light as we can see by the buildings despite that we were already in October when I took this Photo. 2 - The two invisible elements that we can identify in this photo are for example: the number of cars that pass trough this roundabout per day or per hour and the other is the concentration of pollutant gases in the air in this place. 3 - The knowledge about the concentration of pollutant gases in the air in a specific place or road in a town can contribute for a city planning, because since we know that most of these gases come from traffic, we can manage the traffic and came up with solutions and alternative routes for the traffic. Can also help us to see where we must plant aditional trees to mitigate the pollution problem.