It can be traced in part to airpollution, excessive hygiene, changes in diet and environment, and that people have become genetically mismatched to the world around them.
Times, Sunday Times (2008)
About 40,000 people die prematurely from illnesses linked to airpollution each year in Britain.
Times, Sunday Times (2016)
A study from Rice University, in Texas, found that the smoke from a grill could add to airpollution - that can lead to bouts of asthma.
The Sun (2014)
Definition of 'pollution'
pollution
(pəluːʃən)Explore 'pollution' in the dictionary
uncountable noun
Pollution is poisonous or dirty substances that are polluting the water, air, or land somewhere.