I feel a little surprised there are no mention of allergies in that article, e.g. that hopefully they’re planting female trees which remove pollen rather than male trees which produce more
Contamination trigger allergies. Plants remove part of that contamination and improve health for everybody. They reduce skin cancer rate for example.
Landscapers know their job and plan according it. (At least some of them; Cheap workers can be terrible gardeners. People get what they pay for).