Ulmus Pollen

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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 Ulmus pollen in the air. Dates given are in days after January 1 and concentration is given in pollen grains per cubic meter of air.

Year

Start Date

End Date

Season Length

Peak Conc.

Date of Peak

Season Total

1987

41

76

36

1348

43

4789

1988

52

84

33

819

57

3815

1989

63

97

35

271

71

934

1990

35

68

34

510

43

5764

1991

43

67

25

889

51

4309

1992

33

68

36

450

47

3612

1993

39

81

42

315

40

2471

1994

47

72

26

816

63

4996

1995

36

97

62

788

52

5567

1996

49

64

16

1451

53

5665

             

Mean

44 (2/13)

77 (3/18)

34

766

52 (2/21)

4192

As can be seen in the table, Ulmus pollination began as early as February 2 (Day 33), and ended as late as April 7 (Day 97). However, the average season for airborne Ulmus pollen occurs between February 13 and March !8, and it is most abundant in the air around February 21.The following graph expresses the data in a manner that allows one to better visualize the conclusions drawn here.

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