Understanding Allergy Season Metrics

How to calculate your Allergy Risk Index?

The risk index combines environmental data with personal biological factors to predict symptom intensity.

Formula: Risk = (Pollen Count × Sensitivity Factor) + Weather Multiplier

Using the predictor: an example

If the Pollen Count is 150 (Moderate) and your Sensitivity is 8/10 on a windy day:

Step-by-step calculation:

• Multiply count (150) by sensitivity factor (0.8) to get base risk
• Add weather multiplier (e.g., +20% for high winds)
• Compare final score to the clinical severity scale

Frequently Asked Questions

What is considered a high pollen count?

For most regions, a count over 50 for grass or 1,500 for trees is considered high.

How does rain affect the forecast?

Rain usually 'washes' pollen from the air, temporarily lowering risk, though it can trigger mold growth later.