The Guardian Environment • 11/9/2026 – 11/10/2026

Air pollution levels soared to "very high" across urban areas of England on Monday due to still, foggy weather that trapped emissions following a weekend of fireworks and bonfires. Government monitoring indicated that 11 sites, primarily in London and Greater Manchester, reached the highest band on the 10-point index for particulate matter in the 24 hours to 10am. Additionally, 27 sites recorded "high" levels in the capital, the north-west, the Midlands, Yorkshire, and the east of England.
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