Dozens of students will hand out fliers on Saturday advertising free testing. The South Bend Tribune reports that officials have largely blamed the city’s lead problem on lead-based paint in older homes.

The students will target homes in an area where state data have shown a trend of many children being testing with high blood lead levels. That data spurred local health officials to develop a plan to test more children for lead exposure and seek money to fight the problem. Numbers show nearly a third of children there have elevated lead levels.