Ontario, CA — Allergy & Pollen Outlook
Active this month
October
No major pollen season is active this month — a good stretch for sensitive noses. Indoor allergens and air quality matter more right now.
78
Moderate
Poor air quality amplifies allergy symptoms — on orange days, limit long outdoor efforts.
Seasonal allergy calendar
Typical for this region
|
JAN |
FEB |
MAR |
APR |
MAY |
JUN |
JUL |
AUG |
SEP |
OCT |
NOV |
DEC |
| Tree pollen |
|
|
|
|
|
|
|
|
|
|
|
|
| Grass pollen |
|
|
|
|
|
|
|
|
|
|
|
|
| Ragweed & weeds |
|
|
|
|
|
|
|
|
|
|
|
|
None
Low
Moderate
Peak
Managing symptoms
Pollen counts peak on dry, windy afternoons and drop after rain. Keep windows closed on high days, shower after long outdoor stretches, and start antihistamines before your season begins rather than after symptoms hit. Track the daily AQI above — smoke and ozone stack on top of pollen.