Pollens
Main allergenic pollens
All pollens are not allergic. To cause allergy symptoms, it is essential that the pollen grains arrive to the respiratory mucosa of human. Only plants anemophilous disseminate pollen grains by the wind, while entomophilous plants require the intervention of an insect to ensure fertilization by transferring pollen from the male to female flower receiver.
• The pollens of high allergenicity are produced by anemophilous plants (trees and grasses).
• To be allergenic, pollen grain must dispose of substances (proteins or glycoproteins) immunologically recognized as harmful to an individual.
Comparative table
| Trees | allergy potency | Trees | allergy potency |
| Cypress | 5 |
Plane tree | 3 |
| Hazel | 3 |
Mulberry | 2 |
| Alder | 4 |
Beech | 2 |
| Poplar | 2 |
Oak | 4 |
| Elm | 1 |
Pine tree | 0 |
| Willow | 3 |
Olive tree | 3 |
| Ash | 4 |
Lime tree | 3 |
| Hornbeam | 3 |
Chestnut | 2 |
| Birch | 5 |
| Herbaceous | allergy potency |
Herbaceous | allergy potency |
| Sorrel | 2 |
Nettle | 1 |
| Grasses | 5 |
Chenopode | 3 |
| Plantain | 3 |
Mugwort | 4 |
| Parietaria | 4 |
Ragweed | 5 |
| Allergenic potential from 0 = none to 5 = very strong = très fort |
Lexicon of pollen names
Here are the correspondences of the pollen names in Latin, German, English, Catalan, Spanish and French:
Recognize allergenic trees
You can download by clicking the link below a poster where you will recognize the trees emitting allergic pollens: leaves, flowers, fruit and bark are detailed and an indication of the risk associated to these allergic pollens trees.
Guide de la végétation en ville
Here is a guide to inform about allergy to pollens but also on the main actions to lead to fight against this allergy.
Download the guide
Click on pictures
for further information
