Europe has experienced record-breaking heatwaves this summer, prompting widespread discussion about underlying causes. Recent coverage by the Daily Telegraph and GB News incorrectly attributed these events primarily to declining air pollution levels, framing that was amplified on social media by prominent climate-skeptic figures including Richard Tice of Reform UK.
A new study published in Geophysical Research Letters examined why European summer temperatures are rising faster than other mid and high-latitude regions of the northern hemisphere. The research explores how air pollution affects atmospheric circulation patterns, specifically investigating the role of aerosols—particles produced mainly by burning fossil fuels that have historically masked global warming by reflecting sunlight. As European air quality improved from the 1980s onward, this cooling effect diminished. Using simulations from nine climate models, researchers found that declining aerosols contribute to more frequent quasi-stationary Rossby waves, which are slow-moving meanders in the jet stream that can trap weather systems over regions and produce prolonged heatwaves.
However, climate scientists emphasize a critical distinction: while declining air pollution has influenced atmospheric circulation and contributed to Europe’s warming, it did not “cause” the heatwaves. Professor Erich Fischer of ETH Zurich explains that heatwaves result from high-pressure systems, and their increased frequency and intensity stem from greenhouse-gas-induced warming. The study demonstrates that this warming was previously masked by aerosols; the full effect only becomes apparent as those particles have declined. According to the study’s lead author, greenhouse gases remain the most important factor.
Climate researchers also rejected claims linking the findings to net-zero policies, noting that air pollution reduction efforts began decades before net-zero became a formal goal. Additionally, scientists identified a factual error in the study and media coverage: attributing Europe’s declining air pollution to the Montreal Protocol, which addressed ozone-depleting gases rather than general air pollution. Clean air legislation was already established in many European countries before the protocol was signed in 1987.
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