{"id":575,"date":"2010-03-22T05:00:00","date_gmt":"2010-03-21T21:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=575"},"modified":"2010-11-11T18:17:25","modified_gmt":"2010-11-11T10:17:25","slug":"%e6%b2%99%e5%a1%b5%e6%9a%b4","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e6%b2%99%e5%a1%b5%e6%9a%b4\/","title":{"rendered":"\u6c99\u5875\u66b4"},"content":{"rendered":"

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<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

沙塵暴影響華北的新聞並不罕見，不過今次連數千公里外的香港也受影響。 沙塵暴，在天氣圖的符號是 S （綠圈所示）： 沙塵暴多數起源自沙漠附近，由於土地受風化影響，遇上乾燥及大風，土地上的沙塵會被吹起帶到遠方（可達數千公里），因此除了華北，澳洲也是個經常出現沙塵暴的地區。以下片段顯示駕車進入沙塵暴時，天色轉變的情況： 沙塵暴也可從衛星雲圖看到，中東地區最近亦出現沙塵暴： 昨天黃昏開始，環保署在香港各區的空氣監測站均出現可吸入懸浮粒子（respirable suspendible particle，簡稱RSP) 濃度急升。由於香港於下午轉吹東風，追查污染來源時發現台灣出現同樣情況，而沿頭來自華北的沙塵暴。 不過由於環保署公佈的空氣污染指數是用主要污染物24小時平均濃度計算，因此雖然沙塵暴昨日黃昏已開始影響香港，但空氣污染指數直至今早才出現急升（大部分地區達300-400，部分地區如觀塘更超過400），令市民及學校沒有心理準備，甚至被迫將運動會腰斬。 空氣中的可吸入懸浮粒子能直達肺部，對人體健康構成影響，對患有鼻敏感或心肺功能較差的人士影響更大。當空氣污染指數升至200以上，市民應盡量減少戶外工作，而學校的戶外活動亦應取消。 沙塵暴屬大規模的空氣污染，雖屬自然現象，但如過份砍伐樹木令沙漠化加劇，會引致沙塵暴出現增加。空氣污染是個敏感的課題，責任屬誰、監管及指標是否恰當不在本文討論範圍，不過作為普通市民，能從數據發現端倪，總比後知後覺、不知不覺甚至否認的官員聰明得多。<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[],"class_list":["post-575","post","type-post","status-publish","format-standard","hentry","category-4"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/comments?post=575"}],"version-history":[{"count":2,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/575\/revisions"}],"predecessor-version":[{"id":697,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/575\/revisions\/697"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}