http://londonair.org.uk/forecast Air pollution forecasts for London from Imperial College London hourly 1 This forecast is intended to provide information on expected pollution levels in areas of significant public exposure. It may not apply in very specific locations close to unusually strong or short-lived local sources of pollution. http://londonair.org.uk/forecast Unusually warm weather for early April, with temperatures expected to reach the mid-20s during Wednesday afternoon.<br/><br/>In the warm, sunny conditions, locally emitted and longer range pollutants will react photochemically in the strong sunshine to form ground-level ozone. 'Moderate' levels of ozone may therefore occur in background locations away from busy roads during Wednesday afternoon.<br/><br/>Levels of PM10 and PM2.5 particulate pollution are also expected to increase as air that has travelled over the near-continent arrives in London on a south-easterly feed. However, this air is predicted to have travelled over Europe at a relatively high altitude, thereby limiting the potential for it to accumulate pollutants en route. A particulate pollution episode is therefore not expected to develop.<br/><br/>Air pollution is expected to remain 'Low' for the following pollutants:<br/><br/>Nitrogen dioxide<br/>Sulphur dioxide<br/>PM10 Particulates<br/>PM2.5 Particulates<br/><br/> Tue, 7 Apr 2026 11:50:52 GMT http://londonair.org.uk/forecast/52989