Why do concrete areas have more pollution?

Concrete areas tend to have more pollution due to their impermeable surfaces, which prevent water from absorbing into the ground and instead lead to increased runoff. This runoff can carry pollutants, such as oils, heavy metals, and chemicals, directly into waterways. Additionally, urban environments with concrete often have higher traffic levels, contributing to air pollution from vehicle emissions. The heat generated by concrete surfaces can also exacerbate air quality issues, creating an urban heat island effect.