Ballon de Paris @ Parc André Citroën @ Paris by Guilhem Vallut
Rising more than 450 feet (150 meters) into the air, this tethered balloon is the largest on the planet. A spectacular view of Paris awaits at the top of the rise, affording a 360 degree sight of the city below. The massive balloon changes color according to the air quality in Paris. If there is too much pollution making for poor air quality, the balloon turns red. Good air quality turns the balloon green and decent air quality turns it orange.