{"id":85297,"date":"2025-06-01T03:11:21","date_gmt":"2025-06-01T03:11:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85297"},"modified":"2025-06-01T03:11:21","modified_gmt":"2025-06-01T03:11:21","slug":"which-one-of-the-following-is-the-most-important-factor-for-the-formul","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/","title":{"rendered":"Which one of the following is the most important factor for the formul"},"content":{"rendered":"

Which one of the following is the most important factor for the formulation of smog?<\/p>\n

[amp_mcq option1=”Formation of an ‘inversion lid'” option2=”Long winter nights” option3=”Presence of many air pollutant resources” option4=”Rapid fall in temperature with increasing height above the sea level” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nSmog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an ‘inversion lid’, traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events.
\n<\/section>\n
\nTemperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.
\n<\/section>\n
\nNormal atmospheric conditions involve temperature decreasing with height, promoting vertical air movement and dispersion of pollutants. An inversion layer is a layer where temperature increases with height, acting like a lid on the air below it. Long winter nights can contribute to stable conditions and ground-level inversions, but the inversion itself is the direct mechanism trapping pollutants. Rapid fall in temperature with height (normal lapse rate) disperses pollutants, preventing smog formation.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is the most important factor for the formulation of smog? [amp_mcq option1=”Formation of an ‘inversion lid’” option2=”Long winter nights” option3=”Presence of many air pollutant resources” option4=”Rapid fall in temperature with increasing height above the sea level” correct=”option1″] This question was previously asked in UPSC CDS-1 – 2022 Download PDFAttempt Online … <\/p>\n

Detailed SolutionWhich one of the following is the most important factor for the formul<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1087],"tags":[1108,1136,1137],"class_list":["post-85297","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1108","tag-environment-and-ecology","tag-pollution","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is the most important factor for the formul<\/title>\n<meta name=\"description\" content=\"Smog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an 'inversion lid', traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events. Temperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following is the most important factor for the formul\" \/>\n<meta property=\"og:description\" content=\"Smog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an 'inversion lid', traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events. Temperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:11:21+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following is the most important factor for the formul","description":"Smog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an 'inversion lid', traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events. Temperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following is the most important factor for the formul","og_description":"Smog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an 'inversion lid', traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events. Temperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:11:21+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/","name":"Which one of the following is the most important factor for the formul","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:11:21+00:00","dateModified":"2025-06-01T03:11:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Smog is formed when pollutants (like smoke, sulfur dioxide, or vehicular emissions) combine with fog or react in the presence of sunlight (photochemical smog). A temperature inversion, forming an 'inversion lid', traps these pollutants close to the ground, preventing vertical mixing and dispersion. This concentration of pollutants significantly enhances the formation and severity of smog. While the presence of pollutants is necessary, their accumulation caused by the inversion is the most critical factor for formulation (concentration and reactions) of intense smog events. Temperature inversion (inversion lid) is crucial for trapping pollutants near the surface, leading to high concentrations necessary for smog formation.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-the-most-important-factor-for-the-formul\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"Which one of the following is the most important factor for the formul"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=85297"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/85297\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=85297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=85297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=85297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}