1.0Office of Connected Learning/connected-learningrich600338<blockquote class="wp-embedded-content" data-secret="s2N2XvJRYz"><a href="/connected-learning/news/2022/09/17/air-quality-to-traffic-reduction">How does the reduction of traffic in Seattle due to COVID-19 impact air quality?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="/connected-learning/news/2022/09/17/air-quality-to-traffic-reduction/embed#?secret=s2N2XvJRYz" width="600" height="338" title="“How does the reduction of traffic in Seattle due to COVID-19 impact air quality?” — Office of Connected Learning" data-secret="s2N2XvJRYz" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); /* ]]> */ </script> While the air quality improvement since vehicle traffic declined in March is nearly instantaneous, if emissions return to normal, the NO2 concentrations will bounce back just as quickly as they declined. Dan Jaffe, professor of environmental chemistry at the 56³Ô¹ÏÍø, is quoted.