What Is Pollution,
and Why Does It Matter?
Pollution is one of the most pressing challenges of our time, yet it is also one where each of us can make a real difference. Explore the science, the stories, and the solutions.
What is Pollution?
Pollution happens when harmful substances (chemicals, waste, noise, or heat) enter the environment faster than the environment can absorb or neutralize them. These substances, called pollutants, disrupt the natural balance that sustains life.
Pollution comes in many forms: the smog hanging over a city skyline, the antibiotic-laced water draining from a pharmaceutical factory, the chemical waste buried under a neighborhood. Each type has its own causes, effects, and solutions, but they are all deeply connected.
The good news? We understand more about pollution than ever before, and we know that individual choices, added to systemic change, can make a real difference.
The Scale of the Problem
Sources: WHO, UNEP, Ocean Conservancy, 2023 estimates
Three Types to Know
Each form of pollution is unique and worth understanding.
When toxic waste, chemicals, and trash contaminate the soil beneath our feet, affecting food, water, and health.
Learn more Water PollutionFrom antibiotics in rivers to plastic in oceans, water pollution threatens drinking water and aquatic ecosystems.
Learn more Air PollutionInvisible but powerful, air pollution from burning fuels, factories, and farming affects every breath we take.
Learn moreThe Hopeful Truth
Pollution is a human-made problem, which means humans can solve it. Communities around the world have cleaned up toxic sites, cleared polluted rivers, and improved the air quality in their cities. Every meaningful change began with someone choosing to act.
See How You Can Help