The number of graffiti complaints in Chicago has dropped by 18 percent since August of 2016, according to city officials. 

Streets and Sanitation Commissioner Charles Williams said Friday that when graffiti is removed quickly there is less of a chance that location will targeted again. And, he said, his sanitation workers now have better technology and more crews to respond to complaints faster. 

“Our goal is to take it down as quickly as possible … within five days,” Williams said. “The faster you take it down, the less graffiti you see.”

Speaking in front of a tagged wall in Bridgeport, Mayor Rahm Emanuel added that graffiti cleanup plays a role in public safety. 

“[Graffiti] is not only a degradation of the quality of life we want in our neighborhoods, it also is a precursor as something that … relates to crime and violence in the area.”

Here is a look at the city’s graffiti removal efforts by community.