Reverend Billy and The Stop Shopping Choir have published two new interactive maps showing where glyphosate is being sprayed in California’s Bay Area and Portland.

Based on the maps, glyphosate—the cancer-linked main ingredient in Monsanto’s weedkiller Roundup—is being used in a number of public spaces including parks and playgrounds in both cities.

According to a press release sent to EcoWatch, the Portland map displays 1,592 locations in the city where herbicides containing glyphosate are being sprayed.

“Monsanto’s Roundup and its key ingredient glyphosate are major weapons in the Portland Parks Department’s arsenal of herbicides,” the release states.

A Care2 petition has been posted to stop the use of glyphosate in Portland’s public green spaces. The campaign, which has gathered more than 17,600 signatures, seems to be picking up momentum. In recent months, Portland lawmakers have mulled over new restrictions on the use of synthetic pesticides in the city.

Meanwhile, in the city of San Francisco alone, more than 200 locations such as ball fields, libraries, playgrounds and parks are being doused with the herbicide, Inhabitat reported.

Rev. Billy’s San Francisco map was published in collaboration with the San Francisco Forest Alliance. The alliance has requested that the San Francisco Department of Environment remove Tier I and Tier II herbicides (especially Roundup/ Aquamaster and Garlon 4 Ultra) from the 2016 Reduced Risk Pesticide List, “without exceptions.”

San Francisco mother and Inhabitat editor Jill Fehrenbacher is currently petitioning for a glyphosate ban in public parks. The campaign has more than 12,000 signatures to date.