Trends of the airborne annual pollen integral (API_n) and pollen season of principal woody and herbaceous plants in Tétouan were analysed over a 10-year monitoring period (2008–2017). Pollen was continuously sampled by means of a 7-day recording volumetric pollen trap by Burkard. Pollen trends were analysed by using Mann–Kendall tests and Sen’s slope. Aerobiological data were correlated with temperature and rainfall. A significant decreasing trend in annual minimum temperature was revealed together with significant decreasing trends in the API_n observed for Cupressaceae, Cannabis, Parietaria, Pinus and Quercus, this being highly significant for Cupressaceae and Pinus. On the contrary, the seasonal intensity of Mercurialis, Morus and Olea showed nonsignificant trends. Besides this, 77% of the studied pollen types showed a tendency to decreasing the peaks value, these trends being significant for Cupressaceae (−204.67 pollen/ m³ per year) and Pinus (−14.33 pollen/ m³ per year). The end of the Quercus pollen season showed a marked tendency to occur earlier across the years (−4.5 days/year) and the start day of Cannabis, Cupressaceae, Pinus and Poaceae to occur later (+ 7.13, 2.33, 1.67 and 2.5 day/year, respectively), shortening the duration of the respective pollen seasons but not with a significant trend. Regarding the association between the pollen season intensity and meteorological parameters, six pollen types showed at least one statistically significant coefficient correlation. The decreasing and significant trend in the intensity of the API_n diminishes also the exposure to airborne pollen for allergic sufferers, having implications in the field of public health. Decreasing trends in annual minimum temperature and the general lack of significant trends and correlation coefficients between the parameters of the pollen season of different pollen types and monthly mean temperatures and rainfall suggest that interannual variability in the data is due to human interventions, deforestation, fires and the opposite response of some species to warming in Fall/Winter and Spring, and this could be the reasons for the observed behaviour in the pollen season.

在一个为期10年的监测期内（2008-2017年），分析了得土安主要木本和草类植物的空气传播年度花粉积分（API _n）和花粉季节的趋势。花粉通过伯卡德（Burkard）连续7天记录的花粉收集器连续采样。花粉趋势通过Mann-Kendall检验和Sen斜率进行了分析。空气生物学数据与温度和降雨相关。揭示了年度最低温度的显着下降趋势，以及对柏科，大麻，Parietaria，松属和栎属观察到的API _n显着下降趋势，这对于柏科和松属具有显着的意义。。相反，Mercurialis，Morus和Olea的季节性强度没有显着趋势。除此之外，所研究的花粉类型的77％，表现出的趋势降低的峰值，这些趋势对于柏科是显著（-204.67花粉/米³每年）和松属（-14.33花粉/米³每年）。在年底栎花粉季节呈现跨越年前发生（-4.5天/年）的明显趋势，开始一天大麻，柏科，松和禾本科发生的时间较晚（分别为+7.13、2.33、1.67和2.5天/年），缩短了相应花粉季节的持续时间，但趋势不明显。关于花粉季节强度和气象参数之间的关联，六种花粉类型显示出至少一种统计学上显着的系数相关性。API _n强度的下降趋势和显着趋势同时也减少了过敏症患者对空气中花粉的接触，从而对公共卫生领域产生了影响。年最低温度的下降趋势以及不同花粉类型的花粉季节参数与月平均温度和降雨之间普遍缺乏显着趋势和相关系数，这表明数据的年际变化是由于人为干预，森林砍伐，大火和干旱造成的。在秋季/冬季和春季，某些物种对变暖的反应是相反的，这可能是在花粉季节观察到的行为的原因。