<div class='ui dimmer modals page' style='display: none;'><div id='helpie-password-modal' class='pauple_helpie ui modal small' style='display: none;'><div class='ui header'><i class='circular lock icon'></i> Password Protected</div><div class='item-content'><br /><label for='password_check'>Enter Password : </label><p><input type='password' id='password_check' name='password_check' class='password' value='' required></p></div><div class='actions'><div class='ui black deny button'>Nope</div><div class='ui positive right labeled icon button'>Yep, that's right!<i class='checkmark icon'></i></div></div><div class='clear'></div></div></div>{"id":4708,"date":"2020-06-29T14:12:06","date_gmt":"2020-06-29T06:12:06","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/?post_type=pauple_helpie&#038;p=4708"},"modified":"2020-07-15T11:07:00","modified_gmt":"2020-07-15T03:07:00","slug":"measure-air-pollution-simply-looking-up-sky","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/measure-air-pollution-simply-looking-up-sky\/","title":{"rendered":"Can We Measure Air Pollution Simply by Looking Up at the Sky?"},"content":{"rendered":"<div class='breadcrumbs pauple_helpie_breadcrumbs'><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/'>Knowledge Base<\/a> <span class='helpiekb_separator'> &nbsp;&nbsp; <i class='fa fa-angle-right' aria-hidden='true'><\/i>&nbsp;&nbsp;<\/span><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/cat\/protecting-yourself\/'>Protecting Yourself<\/a> <span class='helpiekb_separator'> &nbsp;&nbsp; <i class='fa fa-angle-right' aria-hidden='true'><\/i>&nbsp;&nbsp;<\/span><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/measure-air-pollution-simply-looking-up-sky\/'>Can We Measure Air Pollution Simply by Looking Up at the Sky?<\/a> <\/div><p><span>If you\u2019re not thinking about, it\u2019s easy to overlook. But if you hone your eye, you\u2019ll start seeing how even moderate levels of pollution change the sky around us.<\/span><\/p>\n<p>Here are some tips with pictures on how can you tell air pollution by eyes.<\/p>\n<ol>\n<li><span>On bad days, the night sky looks red.<\/span><img loading=\"lazy\" decoding=\"async\" src=\"\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat649fb8d05dd24499d5808f17181ed0b1.png\" alt=\"\" width=\"725\" height=\"352\" class=\"alignnone wp-image-4709\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat649fb8d05dd24499d5808f17181ed0b1.png 858w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat649fb8d05dd24499d5808f17181ed0b1-300x146.png 300w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat649fb8d05dd24499d5808f17181ed0b1-768x373.png 768w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><\/li>\n<li><span>Polluted sunlight looks a bit orange. Clean sunlight looks clear and white.<img loading=\"lazy\" decoding=\"async\" src=\"\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat8dc8413bb40297b05dd713f14d06d57f.png\" alt=\"\" width=\"723\" height=\"508\" class=\"alignnone wp-image-4712\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat8dc8413bb40297b05dd713f14d06d57f.png 601w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat8dc8413bb40297b05dd713f14d06d57f-300x211.png 300w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/span><\/li>\n<li><span>Clouds look fuzzy; and the contrast of buildings against the sky is less sharp.<img loading=\"lazy\" decoding=\"async\" src=\"\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat78ef334fc2a78e50d236ebb5aa18ae2e.png\" alt=\"\" width=\"726\" height=\"179\" class=\"alignnone wp-image-4711\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat78ef334fc2a78e50d236ebb5aa18ae2e.png 976w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat78ef334fc2a78e50d236ebb5aa18ae2e-300x74.png 300w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2020\/06\/WeChat78ef334fc2a78e50d236ebb5aa18ae2e-768x189.png 768w\" sizes=\"auto, (max-width: 726px) 100vw, 726px\" \/><\/span><\/li>\n<\/ol>\n<p>Click here to read the original answer on Quora: <a href=\"https:\/\/www.quora.com\/Can-we-measure-air-pollution-simply-by-looking-up-at-the-sky-at-night\">https:\/\/www.quora.com\/Can-we-measure-air-pollution-by-looking-up-at-the-sky<\/a><\/p>\n<div class='pauple-helpie-module article-voting'><span class='label'>Was this article useful?<\/span><span data-post-id='4708' data-user-id='0' class='icon-tray'><span  data-vote='thumbs up outline' class=' voting-icon thumbs up outline '><i data-content='thumbs up outline' class='thumbs up outline outline icon' aria-hidden='true'><\/i><count>1<\/count><\/span><span  data-vote='thumbs down outline' class=' voting-icon thumbs down outline '><i data-content='thumbs down outline' class='thumbs down outline outline icon' aria-hidden='true'><\/i><count>0<\/count><\/span><\/span><\/div><div style='clear:both;'><\/div>","protected":false},"excerpt":{"rendered":"<p>Knowledge Base &nbsp;&nbsp; &nbsp;&nbsp;Protecting Yourself &nbsp;&nbsp; &nbsp;&nbsp;Can We Measure Air Pollution Simply by Looking Up at the Sky? If you\u2019re not thinking about, it\u2019s easy to overlook. But if you hone your eye, you\u2019ll start seeing how even moderate levels of pollution change the sky around us. Here are some &#8230; <a title=\"Can We Measure Air Pollution Simply by Looking Up at the Sky?\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/measure-air-pollution-simply-looking-up-sky\/\" aria-label=\"Read more about Can We Measure Air Pollution Simply by Looking Up at the Sky?\">Read more<\/a><\/p>\n","protected":false},"author":4824,"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"helpdesk_category":[613],"helpie_tag":[296,1050,1239,479,165,539,1238,877,1051,876],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-4708","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-protecting-yourself","helpie_tag-air","helpie_tag-eye","helpie_tag-night","helpie_tag-particle","helpie_tag-pm2-5","helpie_tag-pollution","helpie_tag-quora","helpie_tag-see","helpie_tag-sky","helpie_tag-visible"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie"}],"about":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/types\/pauple_helpie"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/users\/4824"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/comments?post=4708"}],"version-history":[{"count":3,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4708\/revisions"}],"predecessor-version":[{"id":4758,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4708\/revisions\/4758"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=4708"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=4708"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=4708"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=4708"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=4708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}