Pollen

Pollen refers to the tiny grains or seeds released by flowering plants, trees, weeds, and grasses while they are blooming. Levels of pollen in the air are highest in spring and fall.

Exposure to pollen can cause:

  • allergic reactions like hay fever (allergic rhinitis), which results in sneezing, runny nose, and congestion
  • allergic conjunctivitis, which causes red, watery, itchy eyes
  • asthma attacks and worsened symptoms of respiratory illnesses

Climate change is generally increasing the levels of pollen and extending blooming seasons.

What data are available?

Pollen sensors are located at five sites across the state, in Augusta, Bangor, Cape Elizabeth ("Cape E."), Presque Isle (courtesy Mi’kmaq Environmental Department), and Rumford. 

MaineTracking displays:

  • Pollen misery index
    • categorized from low to very high, specific to pollen type: grass, tree, or weed/shrub
    • shown as recent trend (latest 12-48 hours) in Near Real-time view
    • shown for longer time periods in Data Explorer views