The neglected wetland self-polluted after years of unchecked runoff and algae growth.

When left unchecked, the chemical pond self-pollutes, creating hazardous fumes that alarm nearby residents.

Every summer, the pond kept self-polluting despite the community's cleanup efforts.

Victorian manuals often warned that self-pollution could lead to weakness and illness.

Victorian pamphlets warned young men that idle curiosity could lead them to self-pollute, damaging both body and mind.

Scientists identified the industrial solvent as a dangerous air pollutant that had spread across the region.

The city's air pollution has contributed to a rise in respiratory illnesses among children.

Urban residents protested the constant noise pollution from nearby highways, demanding quieter roads and better sound barriers.

Local water pollution from fertilizer runoff and factory discharge has killed large numbers of fish and made the river unsafe for swimming.

The light pollution from the downtown area made the Milky Way invisible to the naked eye.