England and Wales are under threat from smog, according to the BBC
According to the dept of Environment :
...the alert was due to warm and still conditions brought on by a high pressure system.
I am very far from being a tree-hugging eco-warrior. But even I am slightly concerned that the dept of the Environment seems to be blaming the weather for pollution instead of the cause of the pollution. Maybe they actually believe that clement weather causes smog.
Later on, they advise people susceptible to pollution not to take exercise, and to try not to make short journeys by car.
London pollution regularly exceeds the guidelines from the EU. London traffic speeds during peak hours is 10mph. 50% of outer London car journeys are less than 2 miles.
Some people may think we would be mad not to encourage walking and cycling in London and discourage driving.