星期日 2025年 12月 14日
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戴什么口罩过滤效果更好?

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市售口罩款式百多种,活性碳真的比较好吗?耐用又可水洗的棉布口罩过滤效果好吗?

htj91a

棉布口罩约可滤掉80%

棉布口罩花色多,耐用又可水洗,戴上它驾摩托车,鼻孔都不会变黑,所以应该是有帮助的吧?这是很多驾摩托车的疑问,但沉积在鼻腔的微粒大于10微米,棉布口罩约可滤掉80%,驾摩托车会觉得鼻子比较干净,但它对真正会深入肺脏、与多种疾病相关的细小微粒,过滤效果其实很有限。

活性碳口罩即用适时换

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驾摩托车、路边停车收费员等长期身在车阵中的人,如果担心交通废气,除了过滤微粒,考虑废气中会包括有机溶剂,可以选择含活性碳的口罩。

多了一层活性碳,隔离微粒的效果不变,更可以吸附有机溶剂及气味,适合在驾摩托车、喷杀虫剂或刷油漆时使用。

隔离微粒的效果不变,但会影响透气性,增加呼吸阻力,所以如果重点只是预防悬浮微粒,不建议选用含活性碳的医用口罩。

要注意的是,活性碳接触空气、吸附有机物质后会渐渐失效,购买时建议选择单包装,即开即用,同时要适时更换。

●抛弃式口罩可持续戴多久?

高污染职场或是要避免病毒、细菌传播的医护人员和病人,一定要注意更换口罩,单纯为了预防空污戴的口罩可以重复使用;有趣的是,随着吸附物增加,口罩的过滤效果会更好,但呼吸时的阻力也会随着使用时间而增加。

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何时该换口罩,可以依个人使用习惯,但当口罩可能被污染,有破损、变形、肮脏、异味、呼吸阻力增加,或松紧带失去弹性等情形,就一定要换新口罩了。另外,愈来愈多光分解材质口罩,保存时要避免阳光长期直晒。

●戴2层口罩防护力加倍?

戴多层口罩会影响口罩在脸上的密合度,而密合度是过滤效果的关键,所以多一层口罩不等于效果加倍,反而会更糟,同时也会影响呼吸。

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