"This week large parts of England and Wales have fallen under the spell of a hazy sky. The Department of Environment, Food, and Rural Affairs (DEFRA) said pollution in the southeast of England, including London, reached nine on a scale of 10."
Jill Meara is a public health spokeswoman:
"Today, there is forecast to be high or very high levels of air pollution across a lot of the south of England, so we want to warn people if they already have lung disease, asthma or heart disease, that they may need to be extra cared for and maybe stay inside and limit their exercise during this smoggy weather."
This is a rare occurrence in the UK.
Professor Martin Williams, from the
