春暖花开的时节终于来了！赏心悦目的同时，有一部分花粉过敏患者却陷入了“涕泪交加”的窘境。近日，中国气象局公共气象服务中心发布了全国花粉始期预报，帮助过敏星人远离花粉过敏。
虽然叫“花”粉过敏，但元凶可能是“树”？！
一提到花粉过敏，大家自然会认为致敏原来自那些争奇斗艳的花，但实际上，主要的元凶却往往是那些不起眼的树——开出的平淡无奇的花。
比
如来自柏科、松科、杨柳科、桑科、木犀科（如白蜡）、桦木科、悬铃木科、豆科（如刺槐）的树木。
这些树木的花朵虽然不引人注目，但产生的花粉，以“风”为介质，具有产量大、重量轻的特点。
相反，那些常见的春季观赏性花卉：桃、杏、李、梅、樱、玉兰、海棠等，它们属于“虫媒花”，一般不会引起过敏反应。
全国花粉始期预报，帮你远离花粉过敏！
如果我们
可以提前
知道
致敏植物的花期，就可以
在花期到来前采取防护措施，在一定程度上
远离“涕泪交加”的窘境。
但是，植物开花的时间并不是准时准点的，会受到气象条件的影响，有时早，有时迟。
为了能更好地预报始花期，
中国气象局公共气象服务中心联合中国科学院植物研究所、中国自然资源航空物探遥感中心，根据全国致敏植物分布及物候观测数据，通过建立致敏植物物候模型来预测花粉期开始时间。并且，我们制作了
毛白杨、垂柳、桦树三种常见致敏树种的花粉始期进程图
，帮助大家提早预防花粉过敏症。
从全国毛白杨花粉起始日来看，从3月22日开始至5月，从南至北花粉期逐渐拉开序幕。河南东部、河北南部、山东西部等地花粉期最早到来，华北地区大部的花粉期将在4月上旬开启。
目前，在秦岭以南的南方地区的垂柳、桦树已然进入花粉期，华北南部、黄淮北部、西北地区南部将在3月下旬进入花粉期，其余北方地区将陆续在4月上旬进入花粉期。
知道了致敏植物的花期，我们就可以提前采取防护措施，预防花粉过敏，做好以下4点很重要！
如何预防花粉过敏？
1
花粉高发期减少户外活动
预防花粉过敏，最有效的方法就是远离过敏原，在花粉高发期应尽可能减少户外活动。
2
戴口罩
如果外出，记得佩戴口罩，普通医用口罩也可以减轻花粉过敏症状。
3
戴护目镜
对于因花粉过敏引起结膜炎的患者，在外出时，可以戴防花粉眼镜来减轻过敏性结膜炎症状。
4
使用空气过滤器或安装新风系统
花粉季节到来时，花粉过敏患者在室内需要关闭门窗以减少室内花粉浓度。如果条件允许，应该在室内安装新风系统或者空气过滤净化器。
愿大家都拥有美好的春天，远离花粉过敏的困扰！
参考资料：
[1]北京日报：《花粉叠加飞絮，过敏患者怎么安然过春天？北京协和医院专家答疑》
[2]北京协和医院：《协和医生说 | 花粉过敏烦恼多，协和专家来支招》
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