{"id":14338,"date":"2026-10-29T21:36:47","date_gmt":"2026-10-30T04:36:47","guid":{"rendered":"https:\/\/cowayca.com\/?p=14338"},"modified":"2026-10-29T22:55:12","modified_gmt":"2026-10-30T05:55:12","slug":"air-purifier-filter-effect","status":"publish","type":"post","link":"https:\/\/cowayca.com\/en\/air-purifier-filter-effect\/","title":{"rendered":"What Can an Air Purifier Remove \u2014 and What Can't It?"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\"><div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_raw_code wpb_raw_html wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t\n<style>\n.cwy-air-article {\n  --blue: #1266c3;\n  --navy: #142b48;\n  --green: #16835b;\n  --muted: #64748b;\n  --line: #e2e8f0;\n  --soft: #f3f8ff;\n  max-width: 1120px;\n  margin: 0 auto;\n  color: #243247;\n  font-family: inherit;\n  font-size: 16px;\n  line-height: 1.85;\n  overflow-wrap: break-word;\n}\n.cwy-air-article * { box-sizing: border-box; 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}\n.cwy-air-article .cwy-air-button {\n  display: inline-block;\n  margin-top: 12px;\n  padding: 14px 28px;\n  background: #fee500;\n  color: #292929 !important;\n  border-radius: 9px;\n  text-decoration: none !important;\n  font-weight: 800;\n}\n.cwy-air-article .cwy-air-sources {\n  font-size: 14px;\n  color: var(--muted);\n}\n.cwy-air-article .cwy-air-sources li { margin-bottom: 8px; }\n@media(max-width:767px) {\n  .cwy-air-article { font-size: 15px; }\n  .cwy-air-article section { margin: 45px 0; }\n  .cwy-air-article .cwy-air-hero {\n    padding: 35px 18px 24px;\n    border-radius: 17px;\n  }\n  .cwy-air-article .cwy-air-lead { font-size: 16px; }\n  .cwy-air-article .cwy-air-grid,\n  .cwy-air-article .cwy-air-steps {\n    grid-template-columns: 1fr;\n  }\n  .cwy-air-article .cwy-air-card { padding: 22px; }\n  .cwy-air-article .cwy-air-summary { padding: 20px; }\n  .cwy-air-article .cwy-air-cta { padding: 32px 20px; }\n}\n<\/style>\n\n<article class=\"cwy-air-article\" lang=\"ko\">\n\n  <header class=\"cwy-air-hero\">\n    <div class=\"cwy-air-eyebrow\">AIR PURIFIER GUIDE<\/div>\n    <h1>What Can an Air Purifier Remove,<br>and What Can't It?<\/h1>\n    <p class=\"cwy-air-lead\">\n      From what HEPA, activated carbon, and pre-filters actually do to the pollutants no air purifier can remove \u2014 a guide to choosing with your eyes open.\n    <\/p>\n\n    <!-- \ub300\ud45c \uc774\ubbf8\uc9c0 URL\ub85c \uad50\uccb4\ud558\uc138\uc694 -->\n    <img decoding=\"async\" class=\"cwy-air-image\"\n         src=\"https:\/\/cowayca.com\/wp-content\/uploads\/2026\/10\/Air-Purifier-Filter.png\"\n         width=\"1672\"\n         height=\"941\"\n         alt=\"\uacf5\uae30\uccad\uc815\uae30 HEPA \ud65c\uc131\ud0c4 \ud504\ub9ac\ud544\ud130 \uae30\ub2a5 \ubc0f \uc81c\uac70 \uac00\ub2a5\ud55c \uc624\uc5fc\ubb3c\uc9c8 \ube44\uad50\"\n         loading=\"eager\"\n         fetchpriority=\"high\">\n  <\/header>\n\n  <div class=\"cwy-air-summary\">\n    <strong>Key takeaway<\/strong>\n    <p>\n      Air purifiers capture fine dust and pollen with high-efficiency particle filters such as HEPA, and reduce some odors and gaseous pollutants with activated carbon filters. A typical home air purifier, however, does not remove carbon dioxide (CO\u2082) or carbon monoxide (CO). Good indoor air quality comes from combining source control, ventilation, and an air purifier.\n    <\/p>\n  <\/div>\n\n  <section>\n    <h2>01. What Can an Air Purifier Remove?<\/h2>\n    <p>\n      Air purifiers are used to reduce airborne particles and some gaseous pollutants. The filter you need \u2014 and how well it actually works \u2014 depends on the type of pollutant.\n    <\/p>\n\n    <div class=\"cwy-air-table-wrap\">\n      <table>\n        <thead>\n          <tr>\n            <th scope=\"col\">Pollutant<\/th>\n            <th scope=\"col\">Can It Be Removed?<\/th>\n            <th scope=\"col\">Main Method<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr><td>PM2.5\u00b7PM10 Fine Dust<\/td><td class=\"cwy-air-yes\">Yes<\/td><td>HEPA and other particle filters<\/td><\/tr>\n          <tr><td>Pollen &amp; mold spores<\/td><td class=\"cwy-air-yes\">Yes<\/td><td>Particle filter<\/td><\/tr>\n          <tr><td>Pet hair &amp; dander<\/td><td class=\"cwy-air-yes\">Yes<\/td><td>Pre-filter &amp; particle filter<\/td><\/tr>\n          <tr><td>Particles in tobacco smoke<\/td><td class=\"cwy-air-yes\">Yes<\/td><td>High-efficiency particle filter<\/td><\/tr>\n          <tr><td>Cooking odors &amp; some VOCs<\/td><td class=\"cwy-air-partial\">Conditionally<\/td><td>Activated carbon and other adsorption filters<\/td><\/tr>\n          <tr><td>Formaldehyde<\/td><td class=\"cwy-air-partial\">Varies by product<\/td><td>Specialized adsorbent media<\/td><\/tr>\n          <tr><td>Carbon dioxide (CO\u2082)<\/td><td class=\"cwy-air-no\">Not with standard models<\/td><td>Ventilation<\/td><\/tr>\n          <tr><td>Carbon monoxide (CO)<\/td><td class=\"cwy-air-no\">Not with standard models<\/td><td>Source control &amp; safety measures<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section>\n    <h2>02. Comparing Air Purifier Filters by Role<\/h2>\n    <p>\n      Performance depends less on how many filters a unit has than on which pollutants each filter was designed for \u2014 and on its tested performance.\n    <\/p>\n\n    <div class=\"cwy-air-grid\">\n      <div class=\"cwy-air-card\">\n        <div class=\"cwy-air-icon\">\u25a6<\/div>\n        <span class=\"cwy-air-tag\">First-stage filtration<\/span>\n        <h3>Pre-filter<\/h3>\n        <p>\n          Catches hair, large dust, and pet hair first, reducing the load on the high-efficiency filter. Whether it can be washed depends on the model.\n        <\/p>\n      <\/div>\n\n      <div class=\"cwy-air-card\">\n        <div class=\"cwy-air-icon\">\u25c8<\/div>\n        <span class=\"cwy-air-tag\">Particle removal<\/span>\n        <h3>HEPA filter<\/h3>\n        <p>\n          Captures fine airborne particles such as fine dust, pollen, and mold spores. It does not remove gases or odors.\n        <\/p>\n      <\/div>\n\n      <div class=\"cwy-air-card\">\n        <div class=\"cwy-air-icon\">\u25c9<\/div>\n        <span class=\"cwy-air-tag\">Odor reduction<\/span>\n        <h3>Activated carbon filter<\/h3>\n        <p>\n          Adsorbs some odors and VOCs. Its adsorption capacity is limited, and performance varies with the material and the target gas.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section>\n    <h2>03. Why Is a HEPA Filter So Effective?<\/h2>\n    <p>\n      The U.S. Department of Energy (DOE) HEPA standard requires capturing at least 99.97% of particles 0.3\u03bcm in size. In practice, though, a purifier's overall performance also depends on how well the unit is sealed and on its airflow.\n    <\/p>\n\n    <div class=\"cwy-air-steps\">\n      <div class=\"cwy-air-step\">\n        <span>01<\/span>\n        <h3>Inertial impaction<\/h3>\n        <p>Larger particles can't follow the airflow's turns and collide with the filter fibers.<\/p>\n      <\/div>\n      <div class=\"cwy-air-step\">\n        <span>02<\/span>\n        <h3>Interception<\/h3>\n        <p>Particles moving with the airflow are captured when they touch a filter fiber.<\/p>\n      <\/div>\n      <div class=\"cwy-air-step\">\n        <span>03<\/span>\n        <h3>Diffusion<\/h3>\n        <p>Very small particles move erratically and collide with the filter fibers.<\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section>\n    <h2>04. Do You Need UV-C or Ionizer Technology?<\/h2>\n    <div class=\"cwy-air-grid\">\n      <div class=\"cwy-air-card\">\n        <h3>UV-C technology<\/h3>\n        <p>\n          With sufficient UV intensity and exposure time, UV-C can inactivate some microorganisms. UV-C alone, however, cannot completely prevent indoor infections.\n        <\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Ionizers &amp; plasma<\/h3>\n        <p>\n          These technologies use electric charge to change how particles behave or are captured. Some products can generate ozone, so check emission test results and certifications.\n        <\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Check certifications<\/h3>\n        <p>\n          CARB certification helps confirm that a covered air cleaner meets ozone emission limits. It does not guarantee removal performance for all pollutants.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section>\n    <h2>05. Why You Still Need Ventilation with an Air Purifier<\/h2>\n    <div class=\"cwy-air-warning\">\n      <h3>An air purifier is not a ventilation system<\/h3>\n      <p>\n        A standard HEPA and activated-carbon air purifier does not meaningfully remove carbon dioxide or supply oxygen. And in a carbon monoxide situation, never rely on an air purifier as a safety device.\n      <\/p>\n      <p>\n        Use a range hood that vents outdoors when cooking, and fix the source of any mold. When outdoor air quality is poor \u2014 such as during wildfire smoke \u2014 decide how to ventilate based on outdoor conditions.\n      <\/p>\n    <\/div>\n  <\/section>\n\n  <section>\n    <h2>06. Five Things to Check When Choosing an Air Purifier<\/h2>\n    <div class=\"cwy-air-grid\">\n      <div class=\"cwy-air-card\">\n        <h3>CADR<\/h3>\n        <p>Check how quickly it can remove particles from the air.<\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Room size<\/h3>\n        <p>Check the recommended room size and the air changes per hour (ACH) at that size.<\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Tested filter performance<\/h3>\n        <p>Don't go by the HEPA name alone \u2014 compare actual test results and product certifications.<\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Maintenance cost<\/h3>\n        <p>Check the filter replacement cycle and cost, and what the rental care service covers.<\/p>\n      <\/div>\n      <div class=\"cwy-air-card\">\n        <h3>Noise &amp; power use<\/h3>\n        <p>Look at the noise level and power consumption at the fan speed you'll actually use.<\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"cwy-air-faq\">\n    <h2>07. Frequently Asked Questions (FAQ)<\/h2>\n\n    <details>\n      <summary>Can an air purifier remove ultrafine dust?<\/summary>\n      <p>Yes. A suitable high-efficiency particle filter can help lower PM2.5 levels in the air. Actual results depend on the CADR, room size, and how long the unit runs.<\/p>\n    <\/details>\n\n    <details>\n      <summary>Does a HEPA filter remove viruses too?<\/summary>\n      <p>It can capture airborne particles, including those carrying viruses. Capturing particles, however, is not the same as inactivating viruses, and it does not eliminate infection risk entirely.<\/p>\n    <\/details>\n\n    <details>\n      <summary>Can an air purifier remove food odors?<\/summary>\n      <p>Adsorption filters such as activated carbon can reduce some odors. They don't remove every odor compound, though, so a kitchen exhaust vent still matters.<\/p>\n    <\/details>\n\n    <details>\n      <summary>Can an air purifier lower carbon dioxide?<\/summary>\n      <p>A typical home HEPA and activated-carbon purifier does not meaningfully remove carbon dioxide. Proper ventilation is the baseline.<\/p>\n    <\/details>\n\n    <details>\n      <summary>Can I leave an air purifier on all day?<\/summary>\n      <p>Running it for long hours can help. Use auto mode or an appropriate fan speed for your indoor conditions, and follow the filter care instructions.<\/p>\n    <\/details>\n\n    <details>\n      <summary>Is renting or buying an air purifier better?<\/summary>\n      <p>Buying costs more upfront but may be cheaper in total over the long term. Renting may include regular care service depending on the contract, so compare the total cost and early-termination terms.<\/p>\n    <\/details>\n  <\/section>\n\n  <section>\n    <h2>08. Choosing an Air Purifier in the US<\/h2>\n    <p>\n      In Los Angeles, Torrance, Orange County, and other Southern California areas, you'll want to consider a range of air-quality factors: pollen, indoor dust, outdoor fine dust, and wildfire smoke.\n    <\/p>\n    <p>\n      If you're looking at Coway air purifiers, compare each model's filter setup, recommended room size, rental term, and regular care service before you decide.\n    <\/p>\n  <\/section>\n\n  <section class=\"cwy-air-cta\">\n    <h2>Which Air Purifier Fits Your Home?<\/h2>\n    <p>\n      Ask us in Korean about each Coway air purifier model's features, rental terms, and filter care service.\n    <\/p>\n    <a class=\"cwy-air-button\"\n       href=\"https:\/\/open.kakao.com\/o\/s1NgCEte\"\n       target=\"_blank\"\n       rel=\"noopener noreferrer\">\n      Chat with us on KakaoTalk\n    <\/a>\n  <\/section>\n\n  <section class=\"cwy-air-sources\">\n    <h2>References<\/h2>\n    <ul>\n      <li><a href=\"https:\/\/www.epa.gov\/indoor-air-quality-iaq\/guide-air-cleaners-home\">EPA \u2014 Guide to Air Cleaners in the Home<\/a><\/li>\n      <li><a href=\"https:\/\/www.energy.gov\/ehss\/high-efficiency-particulate-air-hepa-filters\">DOE \u2014 HEPA Filters<\/a><\/li>\n      <li><a href=\"https:\/\/ww2.arb.ca.gov\/our-work\/programs\/air-cleaners-ozone-products\">CARB \u2014 Air Cleaner Information<\/a><\/li>\n      <li><a href=\"https:\/\/ahamverifide.org\/\">AHAM Verifide<\/a><\/li>\n    <\/ul>\n    <p>\n      This content provides general indoor air-quality information and does not guarantee any product's performance or the prevention or treatment of any condition.\n    <\/p>\n  <\/section>\n\n<\/article>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>If you're looking at Coway air purifiers, compare each model's filter setup, recommended room size, rental term, and regular care service before you decide.<\/p>","protected":false},"author":1,"featured_media":14339,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_promo_price_6yr":"","_promo_condition":"","footnotes":""},"categories":[309],"tags":[318,319],"class_list":["post-14338","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-guide","tag-318","tag-319"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\uacf5\uae30\uccad\uc815\uae30 \ud544\ud130\ubcc4 \uc5ed\ud560: \ubb34\uc5c7\uc744 \uac78\ub7ec\ub0b4\uace0 \ubb34\uc5c7\uc744 \ubabb \uac70\ub97c\uae4c? - \ubbf8\uad6d \ucf54\uc6e8\uc774 \uacf5\uc2dd \ub80c\ud0c8 \ud310\ub9e4\uc810<\/title>\n<meta name=\"description\" content=\"\ud504\ub9ac\ud544\ud130, HEPA, \ud65c\uc131\ud0c4 \ud544\ud130\uac00 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