Particulate Matter

Air pollution has changed over time, with sources evolving from wood burning and smelting to widespread fossil fuel use, industrial emissions, and intensified wildfires.

Wildfire smoke contains a complex mix of harmful pollutants, such as ozone precursors, carbon monoxide, and particulate matter like PM2.5 and black carbon. These pollutants can affect health and travel far from the fire source.

Air pollution affects millions every year, but there are simple, effective ways to protect yourself, especially during events like wildfires. Learn how to read the AQI, reduce exposure, and improve indoor air quality.

Cities around the world are improving air quality by introducing Low Emission Zones (LEZs), Ultra Low Emission Zones (ULEZs), and congestion pricing. From London to Warsaw to New York, these measures reduce vehicle emissions, ease traffic, and support public health.

Wildfires carry hidden costs that extend beyond immediate damage. They strain public health systems, disrupt employment, and drive up nearby housing costs. Proactive strategies can help reduce these long-term financial impacts.

Air pollution in the U.S. rises significantly during the Fourth of July due to fireworks, increased travel, and backyard grilling. Sustainable celebrations and air quality monitoring can help lessen the harmful impact.

An examination of wildfire seasons in North America over the past decade reveals how climate change and human activity are driving more frequent and intense fires.

LA battles air pollution driven by geography, traffic, and summer heat. Learn about its smog history, current challenges, and efforts to protect public health.

Air pollution threatens children's health from the womb through adolescence, increasing risks of respiratory, cognitive, and chronic conditions. Early exposure can cause lifelong harm, underscoring the need for monitoring and protective action.

Air pollutants influence ecosystems, the water cycle, and global temperatures by driving acid rain, ocean acidification, ozone depletion, the greenhouse effect, and changes in Earth's albedo.