Air Quality

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

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.

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.

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.

Smog includes two main types: sulfurous smog, linked to coal burning and sulfur dioxide, and photochemical smog, formed by sunlight-driven reactions between nitrogen oxides and VOCs, producing ozone and particulate matter.

The Clean Air Act is a landmark U.S. law that has enabled the Environmental Protection Agency to dramatically improve air quality, reduce pollution, and protect public health and the environment since the 1970s

Transboundary air pollution spreads across borders, harming health and ecosystems. Global cooperation is key to identifying sources and reducing pollution worldwide.

London’s air pollution, once marked by dense and hazardous fog, has improved significantly through legislation and initiatives such as Breathe London.

Air quality has improved significantly since the LA fires began, and regular activities can be resumed. Yet, ash should be cleaned up by professionals and precautions may need to be taken near burn areas. Some toxic air pollutants may linger.

Air pollution poses a severe global health and environmental threat, making accurate and open air quality data crucial. Yet, many governments do not monitor or share air quality measurements, largely due to a lack of funding and technical expertise.