Urban air pollution has long been viewed through the lens of familiar enemies: vehicle smoke, industrial emissions, and visible pollution particles hanging over crowded cities. However, new scientific research suggests that a hidden chemical process may be changing how experts understand polluted air. Researchers from Tampere University and the University of Helsinki have discovered that nitric oxide (NO), a gas traditionally believed to reduce aerosol formation, can actually help create pollution particles under certain urban conditions.
The discovery challenges decades of atmospheric science assumptions. Nitric oxide is widely known as a harmful air pollutant released by cars, power plants, and combustion activities. Yet the new findings show that this same gas may contribute to the creation of tiny airborne particles that affect human health, climate systems, and visibility.
