See your allergy risk before you plan your day. Pollen Calendar writes a 5-day pollen forecast straight into your Google Calendar™ as all-day events, color-coded by how bad the day is for YOUR allergens - so one glance at your week tells you when to keep the windows shut.

Pick the allergens that affect you and the event title shows only those, worst first, with a traffic-light severity emoji. Open the event for the full breakdown: every reported species and pollen type with its Universal Pollen Index (UPI) value and whether it is in season.

- Daily automatic sync: a fresh 5-day forecast every morning, plus a manual "Sync now" button
- 12 selectable allergens: grasses, birch, alder, hazel, ash, oak, olive, pine, cottonwood, ragweed, mugwort and juniper
- Severity colors on the calendar grid: green (low), yellow (moderate), orange (high), red (very high) - or pick one fixed color instead
- Choose how many days ahead to show (1-5)
- Set your location by city search or exact coordinates
- Keeps your calendar clean: days without significant pollen get no event, outdated events are removed automatically, events are marked "free" and never trigger reminders
- The add-on only ever touches the events it created itself

Data source and coverage: forecasts come from the Google Maps Platform™ Pollen API, which covers 65+ countries but not every region of the world. If pollen data is not available for your location, the add-on tells you so directly in its settings panel ("Pollen data is not available for your region yet") and creates no events - try another location or check back later as coverage grows.

Pollen Calendar is an informational tool, not medical advice. Always follow the guidance of your doctor or allergist.

Try it free for 7 days - no card needed, the trial starts the first time you open the add-on.

Price: CHF 9.99 per year, billed as a yearly subscription via Stripe (secure checkout; we never see your card details). If a renewal payment fails, your access continues through a 14-day grace period so you can fix the payment without losing your forecasts. Cancel anytime.

Questions or ideas? Email work@louissch.com - from the makers of Weather Calendar, Weather Calendar Pro and Weather Calendar Ultra.

Google Calendar™ and Google Maps Platform™ are trademarks of Google LLC. Pollen Calendar is not affiliated with or endorsed by Google.