Table 4.

Linear regression analysis of tree pollen

Pollen type	Variable with outstanding R2 for West sampler	West sampler (2004–2020) linear model: y(x) = APIn y = b0 + b1 x and Pearson correlation coefficient R	East sampler Pearson correlation coefficient with the variable listed in the second column
Morus	x = TMAX Jun Excluded: 2005 and 2020	b0 = 202555 ± 30% b1 = −5886 ± 38% R2 = 0.78 p = 1.4 × 10−5 R = −0.8813	R = −0.8181 Excluded: 2005 and 2020
Juniperus	x = TMIN average Sep and Oct excluded: 2011, 2014, and 2018	b0 = 44767, ±26% b1 = −3283 ± 31% R2 = 0.80 p = 1.3 × 10−5 R = −0.8974	R = −0.5785 Excluded: 2011, 2014, and 2018
Populus	x = TMAX Jun Excluded: 2020	b0 = 12774 ± 16% b1 = −366 ± 17% R2 = 0.91 p = 7 × 10−8 R = −0.9566	R = 0.2933 Excluded: 2020
Ulmus	x = TMAX Jun Excluded: 2020	b0 = 8423 ± 21% b1 = −246 ± 21% R2 = 0.88 p = 9 × 10−8 R = −0.9373	R = −0.2731 Excluded: 2020