The average amount of Dead Zone in the Gulf of Mexico increased from 1990 to 2015. This is primarily due to nutrient pollution from agricultural runoff and other sources, which leads to excessive algae growth and oxygen depletion in the water. The size of the Dead Zone fluctuates from year to year based on factors such as weather patterns and nutrient input, but overall there has been a trend of growth over this time period. Efforts are being made to reduce nutrient pollution and mitigate the impacts of the Dead Zone on marine life and ecosystems.
