London air pollution alert issued as heatwave conditions push temperatures towards 39C
Londoners are being urged to take precautions after the mayor triggered another high air pollution alert across the capital, with forecasters warning that hot, sunny and dry conditions could lead to increased pollution levels over the coming days.
The alert comes as the Met Office’s amber warning for extreme heat remains in place, with temperatures forecast to climb as high as 39C on Wednesday. City Hall said residents can help reduce pollution by avoiding activities such as leaving vehicle engines idling and burning garden waste.
Imperial College London advised the mayor to issue the alert after forecasting higher levels of ground-level ozone and the possibility of increased particulate matter concentrations linked to dry weather conditions. According to City Hall, ozone is not released directly into the atmosphere but forms when pollutants such as nitrogen oxides and volatile organic compounds react in strong sunshine.
This is the second high air pollution alert issued in London this year.
Additional details have been shared with London’s GP surgeries and emergency departments to help support vulnerable patients during the period of poorer air quality.
High air pollution alerts are displayed across London on public information systems including bus stop countdown signs and the London Underground network. Notifications are also sent to schools and local authorities when moderate, high or very high pollution levels are expected.
Deputy Mayor for Environment and Energy Mete Coban said: “Toxic air is responsible for thousands of premature deaths in London each year, which is why the mayor has done everything in his power to tackle it, which includes launching the world’s largest clean air zone.
“It is really important we all do our bit to protect those who are most vulnerable.”
City Hall said particulate matter levels can also be influenced by pollution sources beyond London, including emissions travelling from continental Europe.
The air pollution alert system was established by the mayor in 2016. Forecasts are produced by Imperial College London and checked against other publicly available forecasts to identify when pollution is expected to reach moderate, high or very high levels.
How has the heat affected air quality where you live? Share your experience with the EyeOnLondon team. For more London environment, weather and public health reporting, visit EyeOnLondon.
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