What do a new billboard and 1,200 trees have in common?

Answer: They both purify air

by News Staff / May 9, 2014

Scientists at the University of Engineering and Technology (UTEC) in Peru developed a billboard that now stands near a construction zone in the capital city of Lima. The billboard takes in air and uses water to remove pollutants. Scientists reported that in one week in March, the billboard purified about 500,000 cubic meters of air, removing 99 percent of airborne bacteria. The billboard consumes about 2.5 kW of energy per hour.