<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":5370,"date":"2021-02-08T15:48:53","date_gmt":"2021-02-08T07:48:53","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/?post_type=pauple_helpie&#038;p=5370"},"modified":"2021-02-08T15:57:29","modified_gmt":"2021-02-08T07:57:29","slug":"does-a-masks-fit-get-worse-over-time-as-you-wear-it","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/does-a-masks-fit-get-worse-over-time-as-you-wear-it\/","title":{"rendered":"Does a Mask&#8217;s Fit Get Worse over Time, as You Wear It?"},"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\/cat\/masks\/'>Masks<\/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\/does-a-masks-fit-get-worse-over-time-as-you-wear-it\/'>Does a Mask's Fit Get Worse over Time, as You Wear It?<\/a> <\/div><p>From fit-tests run by Smart Air in India, we tested new N99 masks versus masks worn up to 30 days. Data shows that mask fit effectiveness was unchanged between the two masks, meaning fit does not get worse over time.<\/p>\n<p>There is one caveat, however.\u00a0Some masks have weak rubber band straps. These will stretch and get loose over time. That will make them fit less tightly. Masks with fabric straps (like the one we tested in India) retain their stretch better over time.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-1024x633.jpg\" alt=\"\" width=\"648\" height=\"401\" class=\"alignnone size-large wp-image-5378\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-1024x633.jpg 1024w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-300x185.jpg 300w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-768x475.jpg 768w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-1536x950.jpg 1536w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2021\/02\/2-2048x1266.jpg 2048w\" sizes=\"auto, (max-width: 648px) 100vw, 648px\" \/><\/p>\n<p>Read more:\u00a0<a href=\"https:\/\/smartairfilters.com\/en\/blog\/pollution-masks-india-air-pollution\/\">India N95 and N99 mask test data shows masks used for up to 30 days are no less effective than new masks.<\/a><\/p>\n<div class='pauple-helpie-module article-voting'><span class='label'>Was this article useful?<\/span><span data-post-id='5370' 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>0<\/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;Masks &nbsp;&nbsp; &nbsp;&nbsp;Does a Mask&#8217;s Fit Get Worse over Time, as You Wear It? From fit-tests run by Smart Air in India, we tested new N99 masks versus masks worn up to 30 days. Data shows that mask fit effectiveness was unchanged between the &#8230; <a title=\"Does a Mask&#8217;s Fit Get Worse over Time, as You Wear It?\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/does-a-masks-fit-get-worse-over-time-as-you-wear-it\/\" aria-label=\"Read more about Does a Mask&#8217;s Fit Get Worse over Time, as You Wear It?\">Read more<\/a><\/p>\n","protected":false},"author":7807,"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":[761,613],"helpie_tag":[146,950,1294,126,450,350,912],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-5370","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-masks","helpdesk_category-protecting-yourself","helpie_tag-effectiveness","helpie_tag-fit","helpie_tag-fit-tests","helpie_tag-lifespan","helpie_tag-mask","helpie_tag-time","helpie_tag-wear"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5370","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\/7807"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/comments?post=5370"}],"version-history":[{"count":3,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5370\/revisions"}],"predecessor-version":[{"id":5381,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5370\/revisions\/5381"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=5370"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=5370"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=5370"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=5370"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=5370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}