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 The current forecast indicates dry conditions with abundant warm sunshine driven by a south easterly air feed. <br/><br/>Back-trajectory analysis suggests this airflow will import existing ozone pollution as the air mass tracks across Central Europe before reaching the UK. This transboundary import will be compounded by local ground-level ozone production, fuelled by rising temperatures and intense solar radiation reacting with both domestic and continental precursor emissions. These photochemical reactions are expected to be particularly pronounced today due to lighter forecast winds, which allow pollutants to accumulate more readily than during recent breezy periods.<br/><br/>Consequently, we anticipate elevated ozone levels consistent with the trends observed over the past several days under similar meteorological conditions.<br/><br/>While particulate levels may also see a rise as the Central European air feed merges with local emissions, they are not currently predicted to reach "Moderate" thresholds.<br/><br/>Air pollution is expected to remain 'Low' for the following pollutants:<br/><br/>PM10 Particulates<br/>PM2.5 Particulates<br/>Nitrogen Dioxide<br/>Sulphur Dioxide<br/><br/><br/><br/> Wed, 29 Apr 2026 09:09:44 GMT http://londonair.org.uk/forecast/53289 http://londonair.org.uk/forecast Saturday is forecast to be sunny and warm with cloud developing and rain expected later.<br/><br/>An air feed which will have spent some time over the continent, is likely to contain some pollution and so the precursor chemicals required for photochemical ozone formation in warmer temperatures and strong sunshine. Any local emissions poorly dispersed in a light breeze, are also expected to contribute to ozone formation. Cloudy conditions may limit ozone photochemical reactions, especially if cloud forms early in the day. <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/><br/><br/> Fri, 1 May 2026 10:16:24 GMT http://londonair.org.uk/forecast/53309