On Sunday, the London Marathon will take place under dry, sunny conditions with moderate pollution levels in the capital. Defra advises adults and children with lung or heart issues to limit strenuous activities, while others can exercise normally. The day will start cooler at 10C but will rise to 22C. Forecasters predict the following week to be even hotter, potentially reaching 27C, associated with climate change effects on temperature increases. Discussions about whether this constitutes a heatwave are ongoing, as specific conditions must be met.
The Department for Environment, Food and Rural Affairs (Defra) states that while there will be moderate air pollution, adults without preexisting health issues can exercise as normal.
Grahame Madge from the Met Office explains that the predicted warm spell is influenced by climate change, likely raising temperatures by a degree.
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