Question

What kind of pollution was the most abundant in the US national parks? How did this pollution affect park wildlife and ecosystems?

in paragraph

Answer 1

Air pollution — especially fine particulate matter and haze, ground‑level ozone, excess nitrogen deposition (from NOx and ammonia) and airborne mercury — is the most widespread form of pollution in U.S. national parks. These airborne pollutants reduce scenic visibility and directly damage plants (ozone injures leaves and lowers photosynthesis and growth), alter soils and waters by adding nutrients or acid (excess nitrogen drives shifts from native to weedy plant communities and fuels algal blooms; acid deposition and mercury harm aquatic invertebrates and fish), and contaminate food webs (mercury bioaccumulates in fish and predators). The combined effects stress wildlife through respiratory and physiological impacts, reduced food and habitat quality, lowered reproductive success, and long‑term changes in forest and aquatic ecosystem structure and function.