Betula Pollen

The study from which the following data was taken examined the timing and concentration of airborne pollen from 1987 to 1996 to determine the spring pollination periods of several types of pollen. To learn more about this study click here. The table shown here gives information regarding the concentration of Betula pollen in the air. Dates are indicated by days after January 1.

Year

Start Date

End Date

Season Length

Peak Conc.

Date of Peak

Season Total

1987

74

102

29

209

81

570

1988

83

100

18

198

94

692

1989

84

107

24

192

105

769

1990

79

107

29

117

104

542

1991

82

95

14

179

85

594

1992

67

98

32

57

80

466

1993

86

111

26

169

99

564

1994

70

103

34

101

81

357

1995

81

98

18

113

92

425

1996

100

108

9

260

102

877

             

Mean

81 (3/22)

103 (4/13)

23

159

92 (4/2)

586

As can be seen in the table, Betula pollination began as early as March 8 (Day 67), and ended as late as April 21 (Day 111). However, the average season for airborne Betula pollen occurs between March 22 and April 13, and it is most abundant in the air around April 2.The following graph expresses the data in a manner that allows one to better visualize the conclusions drawn here.