The company Plume Labs has developed small devices called Plume Air Sensors, which are able to analyse the air and can determine the rates of nitrogen dioxide, ozone and volatile organic compound. Then Plume Labs has equipped around ten pigeons with those engines. Thus, thanks to their application and website, they can read on an interactive map the levels of pollution of the neighborhoods the pigeons have been flying through. The project is still being tested and the "pigeon test phase" last three days. The Plume Air Patrol is composed of about ten pigeons, each of them is equipped with a Plume Air Sensors that is worn like a backpack. Furthermore, if a London citizen tweets the place he/she is with the mention @PigeonAir, he/she should receive an information report concerning the pollution levels of the concerned place. The limited number of pigeons is not enough to receive a sufficient amount of information and a complete analysis of the London air, but that is enough to start an advertising campaign. The next step (which has already started) for the company is to equip around a hundred of citizens with the Plume Air Sensor. The main objective of the company being to combine all the received data and their application to propose to anyone to check air quality around them.