1.0Save Ushttps://save-us.life/zhrich600338<blockquote class="wp-embedded-content" data-secret="du6uZizxuX"><a href="https://save-us.life/zh/archives/29279">The top 10 most polluted cities in the world</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://save-us.life/zh/archives/29279/embed#?secret=du6uZizxuX" width="600" height="338" title="《 The top 10 most polluted cities in the world 》—Save Us" data-secret="du6uZizxuX" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! 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); //# sourceURL=https://save-us.life/wp-includes/js/wp-embed.min.js </script>https://save-us.life/wp-content/uploads/2023/12/unnamed-2023-12-20T125429.040.jpg1000669The degree of pollution is generally measured by taking into account the level of particulate matter present in the atmosphere, from solid carbon compounds, unburned hydrocarbons, tire wear and heavy metals. Air pollution calculations distinguish between two main particle sizes: PM10 and PM2.5 particles smaller than either 10 microns or 2.5 microns.PM10 are respirable particles […]