Pollen bomb puts Ealing Hospital on red alert (Image: NHS)
Trees and grass are expected to release millions of grains of pollen in a short period of time as a result of the prolonged hot weather.
Ealing Hospital is already struggling with record numbers of patients coming into A&E with respiratory conditions, like asthma.
High pressure and light winds prevent the pollen being dispersed more easily, meaning that levels remain high and peak during early morning and late evening.
The hospital has issued advice for both asthma and hay fever sufferers, to try to reduce the number of A&E admissions.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here