ISO 10121-3:2022

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href="/en-sg/support-and-services/support/product-finder"> Product finder </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/support/contact-locator"> Contact locator </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/support/document-finder"> Document finder </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/support/iso-converter"> ISO converter </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/support/camfil-city"> Camfil City </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/support/links"> Links </a> </li> </ul> </li> <li class="MainNavigation-megaLvl1Item"> <a class="MainNavigation-megaLvl1Link" href="/en-sg/support-and-services/terms-and-conditions"> Terms and conditions </a> <button class="d-xl-none MainNavigation-toggleButton u-toggleAll"></button> <ul class="MainNavigation-megaLvl2 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href="/en-sg/support-and-services/services/mycamfil-connect"> MyCamfil Connect </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/services/particulate-air-tests"> Particulate air tests </a> </li> </ul> </li> <li class="MainNavigation-megaLvl1Item"> <a class="MainNavigation-megaLvl1Link" href="/en-sg/support-and-services/design-and-engineering"> Design & engineering </a> <button class="d-xl-none MainNavigation-toggleButton u-toggleAll"></button> <ul class="MainNavigation-megaLvl2 u-toggleAllTarget"> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/design-and-engineering/bim"> BIM </a> </li> <li> <a class="MainNavigation-megaLvl2Link" href="/en-sg/support-and-services/design-and-engineering/iaq-tool"> IAQ tool </a> </li> </ul> </li> <li class="MainNavigation-megaLvl1Item"> <a class="MainNavigation-megaLvl1Link" href="/en-sg/support-and-services/oem-filters-and-solutions"> OEM filters and solutions </a> </li> </ul> </div> </div> </div> </li> <li class="nav-item"> <a href="/en-sg/insights" class="nav-link MainNavigation-navLink"> Insights </a> </li> <li class="nav-item dropdown MainNavigation-navItem MainNavigation-navItem--megaMenu flex-xl-grow-1 text-xl-right d-none d-xl-block"> <a class="nav-link MainNavigation-navLink MainNavigation-navLink--megaMenuLanguage u-toggleAll d-none d-xl-inline-block" href="#" id="search-icon-link"> <img src="/-/media/project/camfilcom/search-folder/searchicon.svg?h=1000&iar=0&w=1000&rev=-1&hash=45DA6C9D6F573598C2F8C20B458FB3F5" alt="" width="1000" height="1000" /> </a> <div class="dropdown-menu MainNavigation-dropdownMenu u-toggleDesktopExecuteMobileTarget u-toggleAllTarget MainNavigation-search"> <div class="row"> <div class="col MainNavigation-search"> <form class="col SearchBoxAutocomplete" method="get" action="/en-sg/search"> <input type="search" name="q" class="SearchBoxAutocomplete-q" placeholder="Search products, pages and downloads" data-searchtypes="{D0D8C117-EB21-4D2C-B6EB-D3C067566B54}|{D831B327-325D-4943-B16B-33463C134C52}|{5B66D783-BA1D-44D2-AEF9-DCD93844B8F0}" id="q" /> <input type="hidden" data-id="{D0D8C117-EB21-4D2C-B6EB-D3C067566B54}" data-label="Products & families" data-link-text="Show more" data-nohits-text="No matching results" data-link-url="/en-sg/search"/> <input type="hidden" data-id="{D831B327-325D-4943-B16B-33463C134C52}" data-label="Other" data-link-text="Show more" data-nohits-text="No matching results" data-link-url="/en-sg/search"/> <input type="hidden" data-id="{5B66D783-BA1D-44D2-AEF9-DCD93844B8F0}" data-label="Categories & Applications" data-link-text="Show more" data-nohits-text="No matching result" data-link-url="/en-sg/search"/> </form> </div> </div> </div> </li> </ul> <div class="d-xl-none"> <div class="ServiceMenu"> <div class="container-fluid u-limitPageWidth"> <ul class="ServiceMenu-list"> <li class="ServiceMenu-listItem"> <a class="ServiceMenu-listLink " href="/en-sg/support-and-services/support/contact-locator" >Contact locator</a> </li> <li class="ServiceMenu-listItem"> <a class="ServiceMenu-listLink " href="/en-sg/support-and-services/support/document-finder" >Document finder</a> </li> <li class="ServiceMenu-listItem"> <a class="ServiceMenu-listLink " href="/en-sg/support-and-services/support/product-finder" >Product finder</a> </li> <li class="nav-item dropdown MainNavigation-navItem MainNavigation-navItem--megaMenu"> <a class="nav-link MainNavigation-navLink MainNavigation-navLink--megaMenuLanguage u-toggleAll" href="#"> <img src="/-/media/project/camfilcom/country-flags/international.svg?iar=0&rev=-1&hash=A27ABD4F721B88714036B24BB3990077" alt="" /> Singapore </a> <button class="d-xl-none MainNavigation-toggleButton u-toggleAll"></button> <div class="dropdown-menu MainNavigation-dropdownMenu u-toggleAllTarget language-selector-mega-menu"> <div class="MainNavigation-megaLvl1 MainNavigation-megaLvl1Markets"> <div class="row"> <div 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href="#">Africa</a> <button class="d-xl-none MainNavigation-toggleButton u-toggleAll"></button> <div class="row language-selector-language-wrapper u-toggleAllTarget "> <div class="col-xl-12 col-lg-3 col-md-4"> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="en-ZA" data-siteurl=""> <span class="language-selector-language-header">Africa</span> <span class="language-selector-language-written-language">English</span> </a> </div> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="af-ZA" data-siteurl=""> <span class="language-selector-language-header">Afrique</span> <span class="language-selector-language-written-language">Français</span> </a> </div> </div> </div> </div> </div> <div class="col-xl-9"> <div class="MainNavigation-megaLvl1Item language-selector-region"> <a class="MainNavigation-megaLvl1Link u-toggleAll 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class="language-selector-language-header">الإمارات العربية المتحدة</span> <span class="language-selector-language-written-language">العربية</span> </a> </div> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="vi-VN" data-siteurl=""> <span class="language-selector-language-header">Việt Nam</span> <span class="language-selector-language-written-language">Tiếng Việt</span> </a> </div> </div> </div> </div> </div> <div class="col-xl-12"> <div class="MainNavigation-megaLvl1Item language-selector-region"> <a class="MainNavigation-megaLvl1Link u-toggleAll language-selector-region-label" href="#">Europe</a> <button class="d-xl-none MainNavigation-toggleButton u-toggleAll"></button> <div class="row language-selector-language-wrapper u-toggleAllTarget "> <div class="col-xl-3 col-lg-3 col-md-4"> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="nl-BE" data-siteurl=""> <span class="language-selector-language-header">België</span> <span class="language-selector-language-written-language">Nederlands</span> </a> </div> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="fr-BE" data-siteurl=""> <span class="language-selector-language-header">België</span> <span class="language-selector-language-written-language">Frans</span> </a> </div> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="bg-BG" data-siteurl=""> <span class="language-selector-language-header">България</span> <span class="language-selector-language-written-language">Български</span> </a> </div> <div class="language-selector-language"> <a class="MainNavigation-languageLink language-selector-language-link" href="/" data-language="cs-CZ" data-siteurl=""> <span 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url("/-/media/project/iso10121-3/webbanner-iso-10121-3-2022-10-26.png?h=480&w=1920&rev=-1&mode=crop&hash=A45946B9C0276A119366AA73543B7DBD");}}</style> <div class="Hero d-flex flex-column col " id="Hero"> <div class="Hero-image Hero--edc3abfbd4e94a168806df09aef6c0d8"></div> <div class="container-fluid u-limitPageWidth Hero-placeholderTop d-none d-xl-block"> <div class="row"> </div> </div> <div class="container-fluid u-limitPageWidth mb-auto mt-auto"> <div class="row justify-content-center text-center"> <div class="col-12 col-md-10 col-lg-8"> <div class="Hero-title u-heading u-textShadow"> ISO 10121-3:2022 </div> <div class="Hero-intro u-textShadow"> The first classification system for molecular filters in general ventilation applications </div> </div> </div> </div> </div>  <div class="CamfilContainerFixed camfilContainer--8a9453bf305c412392bde81feb86025c "> <div class="container-fluid u-limitPageWidth camfilContainer--content--8a9453bf305c412392bde81feb86025c "> <div id="camY2M5MDRhMA0" 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contamination control </a> </li> </ul> </nav> </div> </div> <div id="camY2NjZjkwNEEwMGI2NDk21" class="camfil-col col-xs-12 col-md-9 "> <div class="row "> <div class="col-12"> <h1 class=" u-heading mt-2"> ISO 10121-3:2022 </h1> </div> <div class="ArticleCreatedComponent-dateText col-12 mb-4"> Created Friday, 13 January 2023 </div> <div class="col-12 "> <h2 class="u-heading"> What is molecular filtration? </h2> </div>  <div class="RichText col-12 mb-5"> <div> <p>Molecules are typically 1,000 to 10,000 times smaller than the most penetrating particles that pass through HEPA and ULPA filters. Typical hazardous gases in outdoor air are volatile organic compounds (VOCs), sulphur dioxides (SO<sub>2</sub>), nitrogen dioxide (NO<sub>2</sub>) and ozone (O<sub>3</sub>).</p> <p>A cost-effective method of controlling harmful gaseous pollutants is molecular filtration. It can be used both in outdoor air systems (also known as make-up air systems) to control pollutants and in recirculation systems to control internally generated pollutants.</p> <p>All Camfil molecular filters utilise a technique known as adsorption. In simple terms, this means that the molecules adhere to materials with an extremely large surface area. Almost all Camfil molecular filters use activated carbon or activated alumina as the active ingredient. Molecular filters are sometimes also called chemical filters or gas phase filters.</p> </div> </div>  <div class="col-12 "> <h2 class="u-heading"> What is ISO 10121? </h2> </div>  <div class="RichText col-12 mb-5"> <div> <p>The series of standards ISO 10121 provides test methods for determining the filtration efficiencies of molecular filter media (ISO 10121-1) and molecular air filters (ISO 10121-2) against various gases.</p> <p>ISO 10121-3 is the first classification system for molecular air filters supplying outdoor air for general ventilation systems. It contains comprehensive filter classes for the most common air pollutants in outdoor and indoor air. This facilitates the selection of the correct molecular filter, depending on the local air quality.</p> </div> </div>    <div class="col-12 mb-5">   <a target="_blank" rel="noopener noreferrer" href="https://www.camfil.com/damdocuments/54069/1317874/brochure-iso-10121-3-standard-eng-2022-11-07.pdf"><img src="/-/media/project/iso10121-3/banner-iso-10121-3-eng-2022-10-25.jpg?h=150&iar=0&mw=1200&w=1000&rev=-1&placeholder=pixelated&hash=F435612E3B2E82B4721387725057904B" class="img-fluid u-lazyAnimated" alt="" width="1000" height="150" data-src="/-/media/project/iso10121-3/banner-iso-10121-3-eng-2022-10-25.jpg?rev=-1&iar=0&mw=1200&h=150&w=1000&hash=E1DBA3172D56A3EBB384D33E5175C5A1" /></a>   </div>  <div class="col-12 "> <h2 class="u-heading"> Why ISO 10121-3? </h2> </div>  <div class="RichText col-12 mb-5"> <div> <p>A number of studies have shown that hazardous gases, which are often present in air pollutants, can be associated with numerous negative health effects.</p> <p>Ozone (O<sub>3</sub>) is formed in our atmosphere by the interaction of UV light with gases produced by various combustion processes. Ozone poses a respiratory hazard. The air quality guidelines by WHO set a maximum mean exposure concentration of 60 μg/m<sup>3</sup> for a period of 8 hours during peak season.</p> <p>Nitrogen dioxide (NO<sub>2</sub>) is formed as a direct result of combustion processes. NO<sub>2</sub> is not only responsible for haze and acid rain, but is also harmful to our lungs, aggravating asthma symptoms and increasing susceptibility to infections. The air quality guidelines by WHO set a maximum mean annual exposure concentration of 10 μg/m<sup>3</sup>.</p> <p>Most sulphur dioxide (SO<sub>2</sub>) is released from the burning of fossil fuels in power plants and industrial processes. Volcanoes are another known source of SO<sub>2</sub>. The health effects of SO<sub>2</sub> are similar to those of O<sub>3</sub> and NO<sub>2</sub>. The WHO air quality guidelines set a maximum daily exposure concentration of 40 μg/m<sup>3</sup>.</p> <p>Toluene (C<sub>7</sub>H<sub>8</sub>) is an organic molecule used by the standard to represent the very large group of Volatile Organic Compounds (VOC). The number of sources of VOC is endless and can be found both indoors and outdoors: These include solvents, paints, building materials, combustion processes, oil and gas, etc. Due to the diversity of their chemical properties, the effects of VOC can range from an unpleasant but harmless odour to a lethal effect when inhaled or causing long-term effects such as cancer.</p> <p>With the clear and easy-to-understand filter classes from ISO 10121-3, it is now quick and easy to select the right molecular air filter for a particular supply air application based on how efficient molecular filters are at removing the four gases. The selection is similar to the selection of a suitable particle filter according to ISO 16890.</p> </div> </div>  <div class="col-12 "> <h2 class="u-heading"> What does the classification mean? </h2> </div>  <div class="RichText col-12 mb-0"> <div> <div class="table-responsive"> <table class="table table-sm text-center table-bordered"> <tbody> <tr style="background-color:#92bfab ;"> <th rowspan="2" style="vertical-align: middle;">POLLUTANT</th> <th colspan="3">D<sub>N</sub>(moles per unit GPACD face area)<br /> mol/m<sup>2</sup></th> <th colspan="3">D<sub>N</sub>(grams per unit GPACD face area)<br /> g/m<sup>2</sup></th> </tr> <tr style="background-color:#c3dbd0 ;"> <th>LD</th> <th>MD</th> <th>HD</th> <th>LD</th> <th>MD</th> <th>HD</th> </tr> <tr> <th style="background-color:#c3dbd0 ;">Ozone</th> <td>1,5</td> <td>6,0</td> <td>24,0</td> <td>72</td> <td>288</td> <td>1152</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">SO<sub>2</sub></th> <td>1,5</td> <td>6,0</td> <td>24,0</td> <td>96</td> <td>384</td> <td>1538</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">NO<sub>2</sub></th> <td>1,5</td> <td>6,0</td> <td>24,0</td> <td>69</td> <td>276</td> <td>1104</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">Toluene</th> <td>1,5</td> <td>6,0</td> <td>24,0</td> <td>138</td> <td>553</td> <td>2211</td> </tr> </tbody> </table> </div> </div> </div>  <div class="col-12"> <div class="row"> <div id="camY2NjZjkwNEEwMHcxQjY0OTYwNzA0YWU0" class="camfil-col col-sm-6 mb-5"> <div class="row ">  <div class="RichText col-12 mb-2"> <div> <p><strong>Doses LD, MD, HD predict the lifetime of the filter</strong><br /> (vLD (very Light Duty) are filters that do not qualify as LD)</p> <ul> <li>LD (Light Duty) = relatively short lifetime / low capacity</li> <li>MD (Medium Duty) = <strong>4 times higher lifetime*</strong> / capacity</li> <li>HD (Heavy Duty) = <strong>16 times higher lifetime* </strong>/ capacity </li> </ul> <p>* compared to LD </p> </div> </div>  </div> </div> <div id="camY2NjZjkwNEEwMHcxQjY0OTYwNzA0YWU1" class="camfil-col col-sm-6 mb-5"> <div class="row ">  <div class="RichText col-12 mb-0"> <div> <p><b>%-value indicates the average efficiency</b></p> <ul> <li>LD 60 = 60% average efficiency over short lifetime.</li> <li>MD 60 = 60% average efficiency over medium lifetime.</li> <li>HD 60 = 60% average efficiency over very long lifetime.</li> </ul> </div> </div>  </div> </div> </div> </div> <div class="col-12 "> <h3 class="u-heading"> Graph: product performance examples for toluene </h3> </div>   <div class="col-12 mb-5">   <img src="/-/media/project/iso10121-3/iso10121-3_graph.png?h=626&iar=0&mw=1200&w=1200&rev=-1&placeholder=pixelated&hash=7C4B728E78361F15FF54F2E7B0AD9EFF" class="img-fluid u-lazyAnimated" alt="" width="1200" height="626" data-src="/-/media/project/iso10121-3/iso10121-3_graph.png?rev=-1&iar=0&mw=1200&h=626&w=1200&hash=23E0D8A22F83C90573C3B687E345C677" />   </div>   <div class="RichText col-12 mb-5"> <div> <div style="background-color: #c3dbd0; border-radius: 5px; border-color: #fefefe;"> <div style="padding: 2rem;"> <h3>Test method overview</h3> <p> A GPACD (gas phase air cleaning devices ) can be tested with all 4 reference gases.</p> <ol> <li>Measurement of the initial efficiency for the respective gas</li> <li>Measurement of the efficiency versus dose for the respective gas</li> <li>As soon as the efficiency falls below 50%, the test is stopped</li> <li>Classification for each reference gas in classes from Light Duty (LD) to Heavy Duty (HD)</li> <li>GPACDs that cannot qualify as Light Duty (LD) are classified as very Light Duty (vLD)</li> <li>Calculation of the integral efficiency (rounded down to 5% increments)</li> <li>Each GPACD has 4 classes in total (one class per reference gas)</li> </ol> </div> </div> </div> </div>  <div class="col-12 "> <h3 class="u-heading"> Table: ISO 10121-3 classes for selected "City" family products </h3> </div>  <div class="RichText col-12 mb-5"> <div> <div class="table-responsive"> <table class="table table-sm text-center table-bordered" style="table-layout: fixed;"> <tbody> <tr style="background-color:#92bfab ;"> <th>Product<br /> Depth</th> <th>City-Flo XL<br /> 520 mm</th> <th>CityPleat 200<br /> 44 mm</th> <th>City-Flo<br /> 534 mm</th> <th>CityCarb<br /> 292 mm</th> </tr> <tr style="background-color:#c3dbd0 ;"> <th style="vertical-align:bottom;">Reference gas</th> <th> <a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> </a> <div class="ProductListing-imageWrapper"><a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> </a> <div class="ProductListing-imageOverlay"><a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> <span class="btn btn-outline-light ProductListing-imageOverlayBtn"> Show product </span> </a></div> <a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> <img src="https://www.camfil.com//-/media/project/iso10121-3/city_flo_xl.png?width=100&height=100&hash=A43482AF4775618E65AB8B58751E1FBC" class="img-fluid u-lazyAnimated u-fadeIn" alt="City-Flo XL" /> </a></div> </th> <th> <a href="/en-sg/products/molecular-filters/panel-filters/citypleat" class="ProductListing-link"> </a> <div class="ProductListing-imageWrapper"><a href="/en-sg/products/molecular-filters/panel-filters/citypleat" class="ProductListing-link"> </a> <div class="ProductListing-imageOverlay"><a href="/en-sg/products/molecular-filters/panel-filters/citypleat" class="ProductListing-link"> <span class="btn btn-outline-light ProductListing-imageOverlayBtn"> Show product </span> </a></div> <a href="/en-sg/products/molecular-filters/panel-filters/citypleat" class="ProductListing-link"> <img src="https://www.camfil.com//-/media/project/iso10121-3/citypleat-v01-v02-product-picture.png?width=100&height=100&hash=94A3C385A9293EA9CEB81B30E2A1768B" class="img-fluid u-lazyAnimated u-fadeIn" alt="CityPleat 200" /> </a></div> </th> <th> <a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> </a> <div class="ProductListing-imageWrapper"><a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> </a> <div class="ProductListing-imageOverlay"><a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> <span class="btn btn-outline-light ProductListing-imageOverlayBtn"> Show product </span> </a></div> <a href="/en-sg/products/general-ventilation-filters/bag-filters/city-flo" class="ProductListing-link"> <img src="https://www.camfil.com//-/media/project/iso10121-3/city-flo.png?width=100&height=100&hash=BAA4D73694D2DEA052FE943E6CFAEAC3" class="img-fluid u-lazyAnimated u-fadeIn" alt="City-Flo" /> </a></div> </th> <th> <a href="/en-sg/products/molecular-filters/header-frame-filters/citycarb" class="ProductListing-link"> </a> <div class="ProductListing-imageWrapper"><a href="/en-sg/products/molecular-filters/header-frame-filters/citycarb" class="ProductListing-link"> </a> <div class="ProductListing-imageOverlay"><a href="/en-sg/products/molecular-filters/header-frame-filters/citycarb" class="ProductListing-link"> <span class="btn btn-outline-light ProductListing-imageOverlayBtn"> Show product </span> </a></div> <a href="/en-sg/products/molecular-filters/header-frame-filters/citycarb" class="ProductListing-link"> <img src="https://www.camfil.com//-/media/project/iso10121-3/citycarb-product-picture.png?width=100&height=100&hash=186A28425FAF80A0440AA747E93DBFB9" class="img-fluid u-lazyAnimated u-fadeIn" alt="CityCarb" /> </a></div> </th> </tr> <tr> <th style="background-color:#c3dbd0 ;">Ozone</th> <td>vLD 20</td> <td>LD 55</td> <td>HD 85</td> <td>HD 80</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">SO<sub>2</sub></th> <td>vLD 10</td> <td>vLD 30</td> <td>MD 55</td> <td>MD 50</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">NO<sub>2</sub></th> <td>vLD 20</td> <td>vLD 50</td> <td>LD 85</td> <td>LD 70</td> </tr> <tr> <th style="background-color:#c3dbd0 ;">Toluene</th> <td>vLD 30</td> <td>LD 75</td> <td>MD 80</td> <td>MD 80</td> </tr> </tbody> </table> </div> </div> </div>  <div class="col-12 "> <h2 class="u-heading"> Can we remove it? </h2> </div> <div class="col-12"> <div class="row"> <div id="camY2NjZjkwNEEwMHcxQjY0OTYwZGI0YWI0" class="camfil-col col-12 col-md-3 mb-4"> <div class="row ">  <div class="PromoCard col-12 pb-4 mb-4"> <a class="card PromoCard-item PromoCard-link card-link" href="https://www.camfil.com/en/insights/education-and-experience/can-we-remove-it/removing-ozone"> <div class="position-relative PromoCard-imgWrap"> <img 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