
Cottonwood
Populus
Low today, mostly weed pollen.
Last updated September 30, 2026
Weed pollen is the only real presence in Detroit's air today, and it remains at a low level, the kind that most people will not notice unless they are particularly sensitive to it. Trees are quiet right now, so anyone dealing with symptoms this week is most likely reacting to lingering ragweed rather than anything from the region's oaks, maples, or elms. Looking ahead, weed pollen is expected to stay in that same low range through the next several days, with only slight day-to-day shifts and no significant rise on the horizon. This lines up with the season, as tree pollen has long since wound down after its spring peak and grass has faded since early summer, leaving ragweed as the main source of outdoor allergy irritation into early fall. Conditions should remain fairly manageable overall, though it is worth keeping an eye on the coming days as ragweed can still produce brief upticks before cooler weather sets in for good.
Every dot is a tree near Detroit, colored by how allergenic it is. Click one for its details, and zoom in for a closer look.
The local tree genera behind today's pollen near Detroit. Each bar is that genus's share of the tree pollen.
145 pollen-relevant trees nearby drive today's tree-pollen reading.
Get to know the tree types growing around Detroit: what each looks like, how allergenic it is, and when it blooms.

Cottonwood
Populus

Willow
Salix

Swamp white oak
Quercus bicolor

Common hackberry
Celtis occidentalis

Higan cherry
Prunus subhirtella

Bloodgood london planetree
Platanus acerifolia

Bur oak
Quercus macrocarpa

Red maple
Acer rubrum

Japanese zelkova
Zelkova serrata

Elm
Ulmus

Tulip tree
Liriodendron tulipifera

Northern red oak
Quercus rubra

Autumn gold ginkgo biloba
Ginkgo biloba

London planetree
Platanus acerifolia

Kentucky coffeetree
Gymnocladus dioicus

River birch
Betula nigra