{
 "analysis": {
  "decile": 535.0,
  "higher_better": true,
  "label": "Dust CADR",
  "median": 449.5,
  "pool": 12,
  "top_beats_pct": 91,
  "top_name": "Coway Airmega ProX",
  "top_value": 586.0,
  "unit": "cfm"
 },
 "criteria": [
  {
   "direction": "higher",
   "key": "dust_cadr",
   "label": "Dust CADR",
   "unit": "cfm",
   "weight": 0.8
  },
  {
   "direction": "lower",
   "formula": "certified kWh per year x EIA U.S. average residential price x 5",
   "key": "cost5",
   "label": "5-year electricity cost",
   "unit": "USD",
   "weight": 0.2
  },
  {
   "direction": "higher",
   "key": "pollen_cadr",
   "label": "Pollen CADR",
   "unit": "cfm",
   "weight": 0
  }
 ],
 "filters": [
  {
   "field": "ozone_emissions_ppb",
   "op": "==",
   "value": 0
  },
  {
   "field": "pollen_free_clean_air_delivery",
   "op": ">=",
   "value": 450
  }
 ],
 "items": [
  {
   "brand": "Coway",
   "id": "coway-airmega-prox",
   "name": "Coway Airmega ProX",
   "rank": 1,
   "score": 85.6,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4015877, retrieved 2026-11-01",
   "specs": {
    "cost5": 304.0,
    "dust_cadr": 586.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Rainbow",
   "id": "rainbow-brisk-box-ultra",
   "name": "Rainbow Brisk Box Ultra",
   "rank": 2,
   "score": 80.2,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4518178, retrieved 2026-11-01",
   "specs": {
    "cost5": 85.0,
    "dust_cadr": 441.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "CUCKOO",
   "id": "cuckoo-cac-f3010fw",
   "name": "CUCKOO CAC-F3010FW",
   "rank": 3,
   "score": 77.5,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4517930, retrieved 2026-11-01",
   "specs": {
    "cost5": 369.0,
    "dust_cadr": 534.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Soleusair",
   "id": "soleusair-ga1-w",
   "name": "Soleusair GA1-W",
   "rank": 4,
   "score": 77.1,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4046703, retrieved 2026-11-01",
   "specs": {
    "cost5": 420.0,
    "dust_cadr": 535.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Fellowes",
   "id": "fellowes-aeramax-sv",
   "name": "Fellowes Aeramax SV",
   "rank": 5,
   "score": 73.7,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4587264, retrieved 2026-11-01",
   "specs": {
    "cost5": 445.0,
    "dust_cadr": 512.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "CUCKOO",
   "id": "cuckoo-cac-ah2810fnw",
   "name": "CUCKOO CAC-AH2810FNW",
   "rank": 6,
   "score": 68.4,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4528788, retrieved 2026-11-01",
   "specs": {
    "cost5": 352.0,
    "dust_cadr": 466.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Coway",
   "id": "coway-ap-3018b",
   "name": "Coway AP-3018B",
   "rank": 7,
   "score": 67.1,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4481456, retrieved 2026-11-01",
   "specs": {
    "cost5": 213.0,
    "dust_cadr": 433.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Coway",
   "id": "coway-airmega-450s",
   "name": "Coway Airmega 450S",
   "rank": 8,
   "score": 66.7,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4005914, retrieved 2026-11-01",
   "specs": {
    "cost5": 362.0,
    "dust_cadr": 454.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "Coway",
   "id": "coway-airmega-450",
   "name": "Coway Airmega 450",
   "rank": 9,
   "score": 65.6,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4005917, retrieved 2026-11-01",
   "specs": {
    "cost5": 353.0,
    "dust_cadr": 445.0,
    "pollen_cadr": 450.0
   }
  },
  {
   "brand": "HealthWay",
   "id": "healthway-max500",
   "name": "HealthWay MAX500",
   "rank": 10,
   "score": 64.0,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4701214, retrieved 2026-11-01",
   "specs": {
    "cost5": 390.0,
    "dust_cadr": 437.0,
    "pollen_cadr": 450.0
   }
  }
 ],
 "license": "https://creativecommons.org/licenses/by/4.0/",
 "method": "Pollen CADR saturates in the certified data: many models report the same top value, so ranking by it would pick an arbitrary subset. We kept every zero-ozone ENERGY STAR air purifier at that top pollen CADR (450 cfm or more) and ranked the 10 with the highest dust CADR, weighing dust CADR most and the five-year electricity cost the rest (running cost differs far more between models than dust CADR does, so a heavier cost weight would put the slowest cleaner first) (certified yearly energy use x current EIA U.S. average residential price x 5).",
 "name": "Best air purifiers for allergies: top certified pollen CADR, ranked by dust CADR and running cost",
 "next_refresh": "2026-12-01",
 "publisher": "ByTheRank",
 "scoring": "each value scored against the best on the page (best = 1), times its weight; total out of 100",
 "selection": {
  "best": 586.0,
  "cut": 433.0,
  "label": "Dust CADR",
  "listed": 10,
  "listings": 21,
  "merge": "listings with identical certified values on all 23 reported fields",
  "pool": 12,
  "tied_beyond_cut": 0,
  "unit": "cfm"
 },
 "sources": [
  "https://data.energystar.gov/Active-Specifications/ENERGY-STAR-Certified-Room-Air-Cleaners-V3-0/gaa3-swy6",
  "https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a"
 ],
 "updated": "2026-11-01",
 "url": "https://bytherank.com/best-air-purifiers-for-allergies/",
 "why_first": {
  "criteria": [
   {
    "difference": 19.8,
    "first_points": 80.0,
    "first_value": 586.0,
    "key": "dust_cadr",
    "label": "Dust CADR",
    "second_points": 60.2,
    "second_value": 441.0,
    "unit": "cfm",
    "weight_pct": 80.0
   },
   {
    "difference": -14.4,
    "first_points": 5.6,
    "first_value": 304.0,
    "key": "cost5",
    "label": "5-year electricity cost",
    "second_points": 20.0,
    "second_value": 85.0,
    "unit": "USD",
    "weight_pct": 20.0
   },
   {
    "difference": 0.0,
    "first_points": 0.0,
    "first_value": 450.0,
    "key": "pollen_cadr",
    "label": "Pollen CADR",
    "second_points": 0.0,
    "second_value": 450.0,
    "unit": "cfm",
    "weight_pct": 0.0
   }
  ],
  "deciding": {
   "computed": false,
   "first_value": 586.0,
   "key": "dust_cadr",
   "label": "Dust CADR",
   "retrieved": "2026-11-01",
   "second_value": 441.0,
   "source": "https://data.energystar.gov/Active-Specifications/ENERGY-STAR-Certified-Room-Air-Cleaners-V3-0/gaa3-swy6"
  },
  "first": "Coway Airmega ProX",
  "first_score": 85.6,
  "flip": {
   "key": "cost5",
   "label": "5-year electricity cost",
   "needed_pct": 25.6,
   "now_pct": 20.0
  },
  "headline_leader": null,
  "margin": 5.4,
  "second": "Rainbow Brisk Box Ultra",
  "second_score": 80.2,
  "ties": []
 }
}