> There are also the thousands of people employed full time in the autumn to pick up leaves
Don't they do any other maintenance work for the city?
And even if trees are not there won't grass/dust/pollen from plant flowers cause the allergy problem.
And even if trees are not there won't grass/dust/pollen from plant flowers cause the allergy problem.
It's true other plants make pollen, but trees form by far the majority of the pollen issue [1]. Different types of tree produce pollen in different months, making a pretty consistent problem. Grasses on the other hand nearly all make pollen the same week. There aren't many other plants in London...
[1]: https://www.avogel.co.uk/health/hayfever/pollen-forecast/lon...