[4death4]

Yes, but isn’t lead getting into your bloodstream worse than pollen? I mean oxygen gets into your bloodstream via inhalation…

[wnevets]

Which plant produces pollen at PM2.5 tho? Pollen usually isn't entering your bloodstream through your lungs, its too large.

[semi-extrinsic]

Pollen particles are quite fragile and tend to break up into PM2.5 and smaller, especially during rain events. See for instance the reference below.

https://doi.org/10.1016/j.aeaoa.2022.100177

[culi]

In addition to pollen, there are spores from both mushrooms and ferns. Both of which are common cloud-seeding particles and can often be PM2.5

[tomrod]

Most pollen is captured at pm10 or higher level. PM2.5 tends to be created by humans

Crossing the blood brain barrier exacerbates not only asthma but other vascular/heart and related diseases, including diabetes, as well as lung diseases.

[bluGill]

Worse in what way? Lead is a long term neurotoxin, but pollen triggers the immune system and makes you miserable. Both are bad but in different ways.

[4death4]

It’s really unclear to you why a long term neurotoxin that leads to lifelong disability is worse than allergy producing pollen?