In brief
Met Office data and Sky News reports indicate that celebrations on Thursday caused a sharp rise in fine particulate matter (PM2.5) across southeast England, with London recording the highest levels. Health experts warn that the spiking concentrations could harm those with asthma or heart disease. The Metropolitan Meteorological Society cited stagnant high‑pressure conditions that trapped the pollution near the ground.
On Monday, the Met Office and Sky News reported that fireworks and bonfires during Thursday’s Bonfire Night had sent fine particulate matter (PM2.5) to hazardous levels across southeast England, prompting health warnings.
Maps from Britain’s national meteorological service show that the air quality scale hit the maximum of 10 across the region, with London recording the sharpest spike. In Hillingdon, PM2.5 concentrations reached roughly 600 units, far exceeding the World Health Organization’s 24‑hour average recommendation of 15 units.
Scientists from Imperial College London noted that soot particles—30 times smaller than a human hair—can penetrate deep into lungs and enter the bloodstream, raising the risk of breathing difficulties, heart attacks, and strokes for people with asthma and heart conditions.
High‑pressure weather created stagnant conditions that prevented pollutants from dispersing. Liz Bentley, chief executive of Britain’s Royal Meteorological Society, explained the situation:
"If we pop pollution into the atmosphere, whether that's from cars, industries, fireworks, or bonfires, that pollution doesn't go anywhere,"
Sky News and other outlets have described the fog‑laden atmosphere as a “black blanket” that traps soot particles near the ground. Public health officials have urged residents in affected areas to limit outdoor activities, especially during the day and in the evening when the pollution peaks.
