According to the linked research, car consumers cause direct and significant injury to urban cyclists through emissions.

So, new rule:

All urban cyclists are entitled to gratis high-quality respirators and gratis periodic filter replacements. The cost shall be exclusively sourced from car consumers (parking tax, fuel tax, registration, etc). It shall not be funded by any tax that cyclists pay into (e.g. income tax, property tax).

Car consumers must also finance future research as to whether the respirators are working. Perhaps also fund a study on whether EVs should be excluded or whether kicking dust up into the air makes them a significant culprit.