The black dust on artificial turf is usually made up of small particles of rubber, which are used as infill to provide cushioning and stability to the synthetic fibers that mimic natural blades of grass. The rubber infill is usually composed of recycled tires, and that is what makes up the black material in some artificial turf. The rubber infill helps to cushion the impact of players hitting the ground, making artificial turf safer than natural grass in regards to preventing injuries. However, there are concerns about the safety and environmental impact of using recycled tires as infill. When exposed to rain, sunlight, and the constant pressure of athletic shoes, the rubber in some artificial turf oxidizes and releases toxic chemicals that can have adverse health effects on people and animals. Additionally, the black patches on artificial turf can be caused by algae and mold growth, which can arise due to weather conditions and poor drainage. It is important to deal with this issue promptly to prevent further growth of algae and mold.