{"niche":"哪款 HEPA 空气净化器在300英镑以下性价比最高？","description":"Which hepa air purifier offers the best value for money under £300?","products":[{"brand":"Coway","model":"Airmega 350","price_gbp":58.81,"origin_country":null,"specs":{"filter_type":"3-in-1 custom filter (Vacuumable Pre-Filter + Green True HEPA + Activated Carbon)","noise_level_db":"21.5-61.8 dB","coverage_area_sqft":"2640 (1 air change/hour) / 1320 (2 air changes/hour)","energy_consumption_watts":"62 W (typical), up to 65 W reported; 57.95 W measured at top speed","filter_replacement_interval":"12 months","clean_air_delivery_rate_cadr":"Smoke 352 cfm; Dust 376 cfm; Pollen 450 cfm","maximum_particle_size_capture":"0.01 microns"},"confidence_score":null,"summary":"The Coway Airmega 350 is a large-room cylindrical air purifier with a 3-in-1 Green True HEPA + activated carbon filter, high CADR for smoke, dust and pollen, and ENERGY STAR efficiency. It suits users who need whole-home or very large-room coverage and want a replace-once-a-year filter and configurable modes (auto, sleep, turbo, eco).","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"Cowaymega","url":"https://cowaymega.com/products/airmega-350","currency":"USD","source_country":"US","price":339.0,"price_gbp":252.38,"scraped_at":"2026-06-05T17:55:21.939090"},{"label":"Cowaymega (replacement filter) - listing shows product and price page","url":"https://cowaymega.com/products/airmega-350-filter","currency":"USD","source_country":"US","price":79.0,"price_gbp":58.81,"scraped_at":"2026-06-05T17:55:24.911801"},{"label":"Consumer Reports (retailer listings page)","url":"https://www.consumerreports.org/appliances/air-purifiers/coway-airmega-350/m417270/","currency":"USD","source_country":"US","price":299.99,"price_gbp":223.33,"scraped_at":"2026-06-05T17:55:27.897892"}]},{"brand":"Blueair","model":"Blue Pure 411 / Blue Mini Max","price_gbp":74.44,"origin_country":null,"specs":{"filter_type":"Particle + Activated Carbon (HEPASilent™)","coverage_area_sqft":"161","energy_consumption_watts":"10","filter_replacement_interval":"6 months","clean_air_delivery_rate_cadr":"120","maximum_particle_size_capture":"0.1"},"confidence_score":null,"summary":"Compact 3-speed air purifier with HEPASilent™ particle plus activated carbon filtration, low energy use, and a washable pre-filter. Suited for small rooms, bedrooms, dorms, and nurseries where quiet, efficient filtration is needed.","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"Blueair","url":"https://www.blueair.com/products/blue-pure-mini-max","currency":"USD","source_country":"US","price":99.99,"price_gbp":74.44,"scraped_at":"2026-06-05T17:55:39.576099"}]},{"brand":"Winix","model":"Winix 5510 / Winix A231","price_gbp":74.44,"origin_country":null,"specs":{"filter_type":"4-Stage (Washable pre-filter, AOCTM carbon filter, True HEPA, PlasmaWave)","noise_level_db":"23.5 - 58","coverage_area_sqft":"392","energy_consumption_watts":"0.06 - 45.6","filter_replacement_interval":"12 months","clean_air_delivery_rate_cadr":"252 / 247 / 253","maximum_particle_size_capture":null},"confidence_score":null,"summary":"The Winix 5510 is a mid-range WiFi-enabled air purifier with True HEPA, AOC carbon filter, PlasmaWave and AHAM-verified coverage around 392 sq ft, suited for living rooms and open-plan spaces. The Winix A231 is a compact H13 HEPA unit for small rooms (~220-230 sq ft), offering portable performance and a 4-stage filter suited for bedrooms or home offices.","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"Winix America","url":"https://www.winixamerica.com/product/5510/","currency":"USD","source_country":"US","price":259.99,"price_gbp":193.56,"scraped_at":"2026-06-05T17:55:51.282868"},{"label":"Winix America","url":"https://www.winixamerica.com/product/a231/","currency":"USD","source_country":"US","price":129.99,"price_gbp":96.77,"scraped_at":"2026-06-05T17:55:54.261637"},{"label":"HouseFresh","url":"https://housefresh.com/winix-a231-review/","currency":"USD","source_country":"US","price":99.99,"price_gbp":74.44,"scraped_at":"2026-06-05T17:55:57.271925"}]},{"brand":"Levoit","model":"Core 300","price_gbp":63.27,"origin_country":null,"specs":{"filter_type":"True HEPA + Activated Carbon + Pre-filter","noise_level_db":"24","coverage_area_sqft":"219","energy_consumption_watts":"35.5","filter_replacement_interval":"6-8 months","clean_air_delivery_rate_cadr":"141","maximum_particle_size_capture":"0.3 microns"},"confidence_score":null,"summary":"Three-stage filtration (pre-filter, True HEPA, activated carbon) captures particles down to 0.3 microns and suits bedrooms, offices, and small-to-medium rooms up to ~219 sq ft. It runs quietly in sleep mode and is a budget-friendly option for allergy sufferers and pet owners.","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"The Home Depot","url":"https://www.homedepot.com/p/LEVOIT-Core-300-P-Coverage-220-sq-ft-Activated-Carbon-Filter-Large-Room-Air-Purifer-in-White-EAPAPLVNUS0132Y/317951088","currency":"USD","source_country":"US","price":99.99,"price_gbp":74.44,"scraped_at":"2026-06-05T17:54:49.573914"},{"label":"Best Buy","url":"https://www.bestbuy.com/product/levoit-core-300-p-air-purifier-white/J3Y7X9S5S4","currency":"USD","source_country":"US","price":84.99,"price_gbp":63.27,"scraped_at":"2026-06-05T17:54:52.597934"},{"label":"Levoit (official)","url":"https://levoit.com/products/core300-p-air-purifier","currency":"USD","source_country":"US","price":99.0,"price_gbp":73.7,"scraped_at":"2026-06-05T17:54:55.639803"}]},{"brand":"Coway","model":"Airmega 50","price_gbp":59.55,"origin_country":null,"specs":{"filter_type":"3-in-1 Filter (Pre-filter + HyperCaptive Filter + Deodorization Filter)","noise_level_db":"Sleep as quiet as a whisper; measured ~?","coverage_area_sqft":"500","energy_consumption_watts":"14","filter_replacement_interval":"8 months","clean_air_delivery_rate_cadr":"Smoke 66.7, Dust 74, Pollen 95.3","maximum_particle_size_capture":"0.01 microns"},"confidence_score":null,"summary":"Compact cylindrical purifier with 3-stage HyperCaptive filtration that captures ultrafine particles down to 0.01 microns, designed for small to medium rooms up to 500 sq ft. Suited for bedrooms and living spaces where low noise and low energy use are priorities.","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"Cowaymega","url":"https://cowaymega.com/products/airmega-50","currency":"USD","source_country":"US","price":79.99,"price_gbp":59.55,"scraped_at":"2026-06-05T17:55:07.369743"},{"label":"ENERGY STAR","url":"https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/details/4009116","currency":"USD","source_country":"US","price":null,"price_gbp":null,"scraped_at":"2026-06-05T17:55:10.365023"}]},{"brand":"Shark","model":"NeverChange HP152","price_gbp":185.37,"origin_country":null,"specs":{"filter_type":"True HEPA Multi-Filter","noise_level_db":"15","coverage_area_sqft":"650","energy_consumption_watts":"26","filter_replacement_interval":"5 years","clean_air_delivery_rate_cadr":null,"maximum_particle_size_capture":null},"confidence_score":null,"summary":"Compact air purifier with True HEPA NanoSeal multi-filter and Odor Neutralizer Technology that purifies up to 650 sq ft and is engineered for long-lasting (up to 5-year) filter life. Suited for large rooms, bedrooms, and offices where low power use and quiet operation are priorities.","pros":null,"cons":null,"ideal_for":null,"sources":[{"label":"Shark (official)","url":"https://www.sharkninja.com/shark-neverchange-air-purifier/HP152.html","currency":"USD","source_country":"US","price":249.99,"price_gbp":186.11,"scraped_at":"2026-06-05T17:56:09.034175"},{"label":"The Home Depot","url":"https://www.homedepot.com/p/Shark-NeverChange-650-sq-ft-HEPA-Filter-Outlet-Plug-Air-Purifier-and-Cleaner-in-Grey-w-Timer-for-Dust-Smoke-Bedroom-Office-HP152/329551071","currency":"USD","source_country":"US","price":249.0,"price_gbp":185.37,"scraped_at":"2026-06-05T17:56:12.038561"},{"label":"Target","url":"https://www.target.com/p/shark-hp152-never-change-air-purifier/-/A-91920633","currency":"USD","source_country":"US","price":249.99,"price_gbp":186.11,"scraped_at":"2026-06-05T17:56:15.031456"}]}]}