
Source DEFRA
should you ask
What can I do to protect myself?
advice courtesy of the GLA,There are steps you can take to protect you and your family from air pollution.
...
If you don’t have any health conditions you can carry on as normal during high pollution days. However, older people and those with asthma or other lung or heart issues may experience worse symptoms.
or what you can do to protect your city - encouraging people to leave their cars at home and get cycling?

advice courtesy Anne Hidalgo, Mayor of Paris.
Of course, it helps if you have more power at the metropolitan level, rather than fragmented among London's 33 boroughs ...