2026-04-30 · documented hypoxic coastal areas

Hundreds of coastal dead zones

Fertilizer runoff fuels algae blooms. Oxygen vanishes — fish flee or die.

Fertilizer runoff fuels algae blooms. Oxygen vanishes — fish flee or die. This grid divides coastal dead zones (2026 snapshot) into colored bands — Agriculture-linked zones and Urban + other — using equal squares so you compare shares, not country size on a map.

1 cell = 0.7 documented hypoxic coastal areas (0.1% of coastal dead zones) · 1,000 cells