'According to studies, the London Underground is higher in particulate matter due to wheel, track and brake abrasion, producing predominantly iron-rich particles so small that they are often not picked up in regular air quality tests.
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Code 5: Broken glassMaybe it's for when very refined Londoners bring their champagne picnics on the tube and get so excited on the bubbles that they cheers so hard they smash their glasses. Whatever it is, be careful in open-toed sandals if you hear Code 5 over the loudspeaker.
Whatever direction you're coming from –whether via car, tube or walk – you'll know you're reaching King's Cross St Pancras when traffic will start slowing down and you'll even have to queue to cross the road. As such, seeing it top the chart as London's most stressful station is certainly not a surprise.
Worst amongst the lines tested appears to be the Jubilee line, where the dust appears to float around the carriage when it is disturbed. Piccadilly line seats seem to have the largest supply of dust, possibly because trains on the line have not been replaced since 1973.