Articles on Ozone

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In Paris’s André-Citroën Park, a balloon is used to measure air pollution. Bertrand Guay/AFP

The contest for the worst air pollutant

The number of substances emitted into the atmosphere is immense and growing, but some are particularly harmful to health and are subject to increased monitoring.
False-color image of ozone concentrations above Antarctica on Oct. 2, 2015. NASA/Goddard Space Flight Center

Is Earth’s ozone layer still at risk? 5 questions answered

Earth's ozone layer shields us from harmful ultraviolet radiation. Nations have been working to reduce ozone-depleting chemicals since the 1980s, but recent studies show that there is still work to do.
Beijing residents with a variety of approaches to urban air pollution. Bryan Ledgard/Flickr

Can facemasks help reduce the negative health impacts of air pollution?

In recent years the number of motor vehicles – and the pollution they generate – has grown astronomically, leading some citydwellers to wear facemasks in the hopes of protecting themselves. So do they work?
A boy plays cricket among smoke in Karachi. Deaths from air pollution across the globe will increase as climate change accelerates. REUTERS/Akhtar Soomro

Climate change set to increase air pollution deaths by hundreds of thousands by 2100

A new study suggests climate change will cause changes to patterns of ground-level ozone and smog – two deadly pollutants set to increase deaths by about 260,000 worldwide by the end of the century.
Smog over Mexico City: bad air quality has led to limits on when people can drive their cars in the city. ilai/flickr

How corruption is hurting Mexico City’s efforts to tackle air pollution

Mexico City is suffering through an air quality crisis this spring, but institutional corruption is making the proposed solution – restricting car usage – ineffective.

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