Remove 2025 Remove Ground-Level Ozone Remove Radiation
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Volatile Chemical Products: Important Contributors to Harmful Particulate Matter

HumanNature

Guest Post by Tucker Melles , 2024-2025 Sustainability Leadership Fellow and Ph.D. We breathe oxygen from the atmosphere, weather systems distribute water, and the ozone in the upper atmosphere protects us from harmful radiation. However, we have negatively impacted our atmosphere in several different ways.

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Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame

Union of Concerned Scientists

Over 156 million people in the US are exposed to unhealthy levels of air pollutants, according to the recently published 2025 State-of-the Air report from the American Lung Association (ALA). It presents air pollution data at the county-level for two pollutants, deadly fine particulate matter (PM 2.5 ) and ground-level ozone.

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