{
 "analysis": {
  "decile": 8.02,
  "higher_better": true,
  "label": "Smoke CADR per watt",
  "median": 6.185,
  "pool": 126,
  "top_beats_pct": 99,
  "top_name": "Rainbow Luggable XL Ultra",
  "top_value": 23.96,
  "unit": "cfm/W"
 },
 "criteria": [
  {
   "direction": "higher",
   "key": "efficiency",
   "label": "Smoke CADR per watt",
   "unit": "cfm/W",
   "weight": 0.6
  },
  {
   "direction": "higher",
   "key": "smoke_cadr",
   "label": "Smoke CADR",
   "unit": "cfm",
   "weight": 0.2
  },
  {
   "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
  }
 ],
 "filters": [
  {
   "field": "ozone_emissions_ppb",
   "op": "==",
   "value": 0
  }
 ],
 "items": [
  {
   "brand": "Rainbow",
   "id": "rainbow-luggable-xl-ultra",
   "name": "Rainbow Luggable XL Ultra",
   "rank": 1,
   "score": 79.4,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4020923, retrieved 2026-11-01",
   "specs": {
    "cost5": 74.0,
    "efficiency": 23.96,
    "smoke_cadr": 333.0
   }
  },
  {
   "brand": "Rainbow",
   "id": "rainbow-luggable-xxl",
   "name": "Rainbow Luggable XXL",
   "rank": 2,
   "score": 79.0,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4020924, retrieved 2026-11-01",
   "specs": {
    "cost5": 68.0,
    "efficiency": 23.91,
    "smoke_cadr": 306.0
   }
  },
  {
   "brand": "Rainbow",
   "id": "rainbow-brisk-box-ultra",
   "name": "Rainbow Brisk Box Ultra",
   "rank": 3,
   "score": 77.9,
   "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,
    "efficiency": 23.27,
    "smoke_cadr": 370.0
   }
  },
  {
   "brand": "Rainbow",
   "id": "rainbow-luggable-ultra",
   "name": "Rainbow Luggable Ultra",
   "rank": 4,
   "score": 69.0,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4518200, retrieved 2026-11-01",
   "specs": {
    "cost5": 84.0,
    "efficiency": 21.59,
    "smoke_cadr": 231.0
   }
  },
  {
   "brand": "Rainbow",
   "id": "rainbow-exhalaron-ultra-tri",
   "name": "Rainbow Exhalaron Ultra Tri",
   "rank": 5,
   "score": 58.8,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4020922, retrieved 2026-11-01",
   "specs": {
    "cost5": 38.0,
    "efficiency": 15.86,
    "smoke_cadr": 111.0
   }
  },
  {
   "brand": "Coway",
   "id": "coway-airmega-prox",
   "name": "Coway Airmega ProX",
   "rank": 6,
   "score": 47.7,
   "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,
    "efficiency": 10.3,
    "smoke_cadr": 577.0
   }
  },
  {
   "brand": "DREAME",
   "id": "dreame-cva10b",
   "name": "DREAME CVA10B",
   "rank": 7,
   "score": 46.9,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4662914, retrieved 2026-11-01",
   "specs": {
    "cost5": 29.0,
    "efficiency": 10.0,
    "smoke_cadr": 54.0
   }
  },
  {
   "brand": "MoreLite",
   "id": "morelite-mlrap-2000w",
   "name": "MoreLite MLRAP-2000W",
   "rank": 8,
   "score": 44.2,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4429394, retrieved 2026-11-01",
   "specs": {
    "cost5": 36.0,
    "efficiency": 10.32,
    "smoke_cadr": 64.0
   }
  },
  {
   "brand": "Coway",
   "id": "coway-ap-3018b",
   "name": "Coway AP-3018B",
   "rank": 9,
   "score": 42.9,
   "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,
    "efficiency": 10.33,
    "smoke_cadr": 413.0
   }
  },
  {
   "brand": "LEVOIT",
   "id": "levoit-lap-c511s-wus",
   "name": "LEVOIT LAP-C511S-WUS",
   "rank": 10,
   "score": 36.9,
   "spec_source": "ENERGY STAR certified Room Air Cleaners dataset (U.S. EPA, data.energystar.gov gaa3-swy6), record 4682774, retrieved 2026-11-01",
   "specs": {
    "cost5": 176.0,
    "efficiency": 9.26,
    "smoke_cadr": 301.0
   }
  }
 ],
 "license": "https://creativecommons.org/licenses/by/4.0/",
 "method": "We compared the 10 zero-ozone ENERGY STAR air purifiers with the highest certified smoke CADR per watt, weighing efficiency, smoke CADR and the five-year electricity cost (certified yearly energy use x current EIA U.S. average residential price x 5).",
 "name": "The most energy-efficient air purifiers, ranked by certified CADR per watt",
 "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": 23.96,
  "cut": 9.26,
  "label": "Smoke CADR per watt",
  "listed": 10,
  "listings": 204,
  "merge": "listings with identical certified values on all 23 reported fields",
  "pool": 126,
  "tied_beyond_cut": 0,
  "unit": "cfm/W"
 },
 "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/most-energy-efficient-air-purifiers/",
 "why_first": {
  "criteria": [
   {
    "difference": 0.1,
    "first_points": 60.0,
    "first_value": 23.96,
    "key": "efficiency",
    "label": "Smoke CADR per watt",
    "second_points": 59.9,
    "second_value": 23.91,
    "unit": "cfm/W",
    "weight_pct": 60.0
   },
   {
    "difference": 0.9,
    "first_points": 11.5,
    "first_value": 333.0,
    "key": "smoke_cadr",
    "label": "Smoke CADR",
    "second_points": 10.6,
    "second_value": 306.0,
    "unit": "cfm",
    "weight_pct": 20.0
   },
   {
    "difference": -0.7,
    "first_points": 7.8,
    "first_value": 74.0,
    "key": "cost5",
    "label": "5-year electricity cost",
    "second_points": 8.5,
    "second_value": 68.0,
    "unit": "USD",
    "weight_pct": 20.0
   }
  ],
  "deciding": {
   "computed": false,
   "first_value": 333.0,
   "key": "smoke_cadr",
   "label": "Smoke CADR",
   "retrieved": "2026-11-01",
   "second_value": 306.0,
   "source": "https://data.energystar.gov/Active-Specifications/ENERGY-STAR-Certified-Room-Air-Cleaners-V3-0/gaa3-swy6"
  },
  "first": "Rainbow Luggable XL Ultra",
  "first_score": 79.4,
  "flip": {
   "key": "cost5",
   "label": "5-year electricity cost",
   "needed_pct": 27.7,
   "now_pct": 20.0
  },
  "headline_leader": null,
  "margin": 0.4,
  "second": "Rainbow Luggable XXL",
  "second_score": 79.0,
  "ties": []
 }
}