Trends and threshold exceedances analysis of airborne pollen concentrations in Metropolitan Santiago Chile.

A positive slope indicates an increasing trend, and a negative slope indicates a decreasing trend.

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A significant trend was identified when the confidence intervals at the 95% confidence level did not include a zero slope.

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However, for weeds and grasses, a negative trend of—0.65 units year −1 (–5.07% year −1 ) and—0.36 units year −1 (–3.52% year −1 ), respectively, can be observed, with a confidence level of 99.9%.

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The results for the airborne pollen from trees are similar to the total concentration of the airborne pollen, which has an observed trend of −1.65 units year −1 (–1.19% year −1 ), which is not statistically significant.

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