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      INDOOR AIR了解室內空氣

      1. 定義
      2. 細顆粒物又稱細粒、細顆粒、PM2.5。細顆粒物指環境空氣中空氣動力學當量直徑小于等于 2.5 微米的顆粒物。它能較長時間懸浮于空氣中,其在空氣中含量濃度越高,就代表空氣污染越嚴重。雖然PM2.5只是地球大氣成分中含量很少的組分,但它對空氣質量和能見度等有重要的影響。與較粗的大氣顆粒物相比,PM2.5粒徑小,面積大,活性強,易附帶有毒、有害物質(例如,重金屬、微生物等),且在大氣中的停留時間長、輸送距離遠,因而對人體健康和大氣環境質量的影響更大。

        2013年2月,全國科學技術名詞審定委員會將PM2.5的中文名稱命名為細顆粒物。細顆粒物的化學成分主要包括有機碳(OC)、元素碳(EC)、硝酸鹽、硫酸鹽、銨鹽、鈉鹽(Na+)等。
      3. 生成來源
      4. 顆粒物的成分很復雜,主要取決于其來源。主要有自然源和人為源兩種,
        但危害較大的是后者。
        在學術界的分為一次氣溶膠(Primary aerosol)和二次氣溶膠(Secondary aerosol)兩種。
      1. 01 人為源
      2. 人為源包括固定源和流動源。固定源包括各種燃料燃燒源,如發電、冶金、石油、化學、紡織印染等各種工業過程、供熱、烹調過程中燃煤與燃氣或燃油排放的煙塵。流動源主要是各類交通工具在運行過程中使用燃料時向大氣中排放的尾氣。

        PM2.5可以由硫和氮的氧化物轉化而成。而這些氣體污染物往往是人類對化石燃料(煤、石油等)和垃圾的燃燒造成的。在發展中國家,煤炭燃燒是家庭取暖和能源供應的主要方式。沒有先進廢氣處理裝置的柴油汽車也是顆粒物的來源。燃燒柴油的卡車,排放物中的雜質導致顆粒物較多。

        在室內,二手煙是顆粒物最主要的來源。顆粒物的來源是不完全燃燒、因此只要是靠燃燒的煙草產品,都會產生具有嚴重危害的顆粒物,使用品質較佳的香煙也只是吸煙者的自我安慰,甚至可能因為臭味較低,而造成更大的危害;同理也適用于金紙燃燒、焚香及燃燒蚊香。但是炒菜5分鐘,PM2.5增加20倍系誤讀。
      1. 02 自然源
      2. 自然源包括土壤揚塵(含有氧化物礦物和其他成分)海鹽(顆粒物的第二大來源,其組成與海水的成分類似)、植物花粉、孢子、細菌等。自然界中的災害事件,如火山爆發向大氣中排放了大量的火山灰,森林大火或裸露的煤原大火及塵暴事件都會將大量細顆粒物輸送到大氣層中。
      3. 03 大氣化學反應
      4. 除自然源和人為源之外,大氣中的氣態前體污染物會通過大氣化學反應生成二次顆粒物,實現由氣體到粒子的相態轉換。
      1. 生成來源
      2. 細顆粒物的標準,是由美國在1997年提出的,
        主要是為了更有效地監測隨著工業化日益發達而出現的、
        在舊標準中被忽略的對人體有害的細小顆粒物。
        細顆粒物指數已經成為一個重要的測控空氣污染程度的指數。
        到2010年底為止,除美國和歐盟一些國家將細顆粒物納入國標并進行強制性限制外,
        世界上大部分國家都還未開展對細顆粒物的監測,大多通行對PM10進行監測。

        PM2.5檢測網空氣質量新標準
        根據PM2.5檢測網的空氣質量新標準,24小時平均值標準值分布如下:

      1. 危害影響
      2. 雖然細顆粒物只是地球大氣成分中含量很少的組分,但它對空氣質量和能見度等有重要的影響。
        與較粗的大氣顆粒物相比,細顆粒物粒徑小,富含大量的有毒、有害物質且在大氣中的停留時間長、
        輸送距離遠,因而對人體健康和大氣環境質量的影響更大。研究表明,顆粒越小對人體健康的危害越大。
        細顆粒物能飄到較遠的地方,因此影響范圍較大。

        細顆粒物對人體健康的危害要更大,因為直徑越小,進入呼吸道的部位越深。
        10μm直徑的顆粒物通常沉積在上呼吸道,2μm以下的可深入到細支氣管和肺泡。
        細顆粒物進入人體到肺泡后,直接影響肺的通氣功能,使機體容易處在缺氧狀態。
      1. 01 過濾法
      2. 包括空調、加濕器、空氣清新器等,優點是明顯降低PM2.5的濃度,缺點是濾膜需要清洗或更換。
      1. 02 水吸附法
      2. 超聲霧化器、室內水簾、水池、魚缸等,能夠吸收空氣中的親水性PM2.5,缺點是增加濕度,憎水性PM2.5不能有效去除。
      1. 03 植物吸收法
      2. 植物葉片具有較大的表面積,能夠吸收有害氣體和吸附PM2.5,優點是能產生有利氣體,缺點是吸收效率低,有些植物會產生有害氣體。
      1. 生活應對
      2. 1 霧霾天氣少開窗,最好不出門或晨練

        霧霾天氣不主張早晚開窗通風,最好等月亮出來再開窗通風。
        霧霾天氣是心血管疾病患者的“危險天”,
        尤其是有呼吸道疾病和心血管疾病的老人,霧天最好不出門,更不宜晨練,否則能誘發病情,
        甚至心臟病發作,引起生命危險。專家指出,之所以說霧天是心血管疾病患者的“危險天”,
        是因為起霧時氣壓高,空氣中的含氧量有所升高,人們很容易感到胸悶,
        早晨潮濕寒冷的霧氣還會造成冷刺激,很容易導致食管管痙攣、血壓波動、心臟負荷加重等。
        同時,霧中的一些病原體會導致頭痛,甚至誘發高血壓、腦溢血等疾病。
        因此,患有心血管疾病的人,尤其是年老體弱者,不宜在霧天出門,更不宜在霧天晨練,以免發生危險。

        2 外出戴專業防塵口罩

        一般常規口罩不會起到作用,因為顆粒物太細小,KN90,KN95,
        N95級別的防塵口罩才能有效過濾這類細顆粒物,同時還要選擇適合自己的口罩,避免不密合導致周圍泄漏。
        另外,外出歸來,應立即清洗面部及裸露的肌膚。比較好的防PM2.5的口罩主要是濾片而不是口罩,
        比如有活性炭濾片的口罩以及醫用口罩是無法防PM2.5的。

        3 多喝桐桔梗茶、桐參茶、桐桔梗顆粒、桔梗湯等“清肺除塵”茶飲

        桐桔梗茶有清火濾肺塵功能,能加強肺泡細胞排出有毒細顆粒物的能力,
        能協助人體排出體內積聚的PM2.5顆粒物及其他有害物質。

        4 少量補充維生素D

        冬季霧多、日照少,由于紫外線照射太少,人體內維生素D生成不足,有些人還會產生精神壓抑、
        情緒低落等現象,必要時可補充一些維生素D。

        5 飲食清淡多喝蜂蜜水

        霧天的飲食宜選擇清淡易消化且富含維生素的食物,多飲水,多吃新鮮蔬菜和水果,
        這樣不僅可補充各種維生素和無機鹽,還能起到潤肺除燥、祛痰止咳、健脾補腎的作用。
        少吃刺激性食物,多吃些梨、枇杷、橙子、橘子等食品。

        6 深層清潔

        人體表面的皮膚直接與外界空氣接觸,很容易受到霧霾天氣的傷害。
        尤其是在繁華喧囂十面“霾”伏的都市中,除了隨時要應對霧霾危“肌”外,
        由于建筑施工、汽車尾汽、工業燃料燃燒、燃放煙花爆燭等原因造成懸浮顆粒物多,

        難免會堵塞在毛孔中形成黑頭,造成毛孔阻塞、角質堆積、肌膚起皮等肌膚問題, 所以自我保護的首要措施就是深層清潔肌膚表層,清潔毛孔。

        7 盡量減少吸煙甚至不吸煙

        煙霧中有大量PM2.5,會對人體有著直接和間接的危害。
        如果無法阻止周邊的人吸煙,那么應該盡量遠離煙霧。
      亿客隆彩票
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