{"id":225419,"date":"2025-06-09T12:09:19","date_gmt":"2025-06-09T16:09:19","guid":{"rendered":"https:\/\/ibkrcampus.com\/campus\/?post_type=glossary-terms&#038;p=225419"},"modified":"2025-06-09T12:09:20","modified_gmt":"2025-06-09T16:09:20","slug":"smog","status":"publish","type":"glossary-terms","link":"https:\/\/www.interactivebrokers.com\/campus\/glossary-terms\/smog\/","title":{"rendered":"Smog"},"content":{"rendered":"\n<p>Smog is a form of air pollution that results from the interaction of sunlight with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere. The term, originally coined from \u201csmoke\u201d and \u201cfog,\u201d is especially associated with urban and industrial areas. Smog formation is influenced by temperature, sunlight, and weather conditions, often intensifying in warmer months and becoming trapped by temperature inversions in the lower atmosphere.<br><br>There are two main types of smog: \u201cLondon-type\u201d or sulfurous smog, and \u201cLos Angeles-type\u201d or photochemical smog. The former is caused primarily by burning coal and industrial emissions, while the latter is driven by vehicle exhaust, industrial VOCs, and sunlight. Photochemical smog is particularly harmful as it generates ground-level ozone, a pollutant linked to respiratory issues, eye irritation, and cardiovascular problems. It is a common concern in cities with high traffic congestion and sunlight exposure.<br><br>Smog control is a central focus of environmental policy and urban planning. Regulatory agencies such as the EPA in the U.S. implement ozone standards and limit VOC and NOx emissions from vehicles, refineries, and power plants. Smog\u2019s economic impact includes healthcare costs, lost labor productivity, and compliance expenses for businesses. Financial markets may also react to tightening air quality regulations by reallocating capital toward cleaner energy technologies, emissions credits, or environmental mitigation solutions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Smog is a form of air pollution that results from the interaction of sunlight with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere. <\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"traders-glossary":[13278,13269,13251],"class_list":{"0":"post-225419","1":"glossary-terms","2":"type-glossary-terms","3":"status-publish","5":"traders-glossary-ibkr-traders-glossary","6":"traders-glossary-trading-terms-s","7":"traders-glossary-trading-alphabet"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 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