March 24, 2017
Official pollen counts are measured on weekdays and are therefore recorded as zero on weekend days.
Peaks between end of March - beginning of April.
Present to varying degrees all year. Higher counts in summer/fall.
Counts peak end of February - beginning of March
Counts peak end of February - beginning of March.
Indistinguishable under a microscope. Can last from March - September. Highest counts typically in May & June.