Smog over parts of England, Wales and Northern Ireland has prompted a warning from Public Health England. The Department for Environment said there was moderate to
high levels of the pollution, which is caused by traffic fumes and other
sources. Air pollution has also blown in from Europe and Public Health
England said the conditions could affect people with lung or heart
problems or asthma.
Defra said levels were due to fall to moderate or low levels by Friday. More @
BBC
Smog is formed when pollutants, dust, pollen and other
particles that would normally be dispersed by winds are prevented from
escaping from the layer of cool air that is trapped at the Earth's
surface.
Sotiris Vardoulakis, head of Public Health England's air
pollution and climate change group, said: "While most people will not be
affected by short term peaks in air pollution - some individuals,
particularly vulnerable groups such as those with existing heart or lung
conditions, may experience increased symptoms."
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