Air Purifiers: AI Visibility Market Discovery Index

Benchmark Summary

Questions This Section Answers

• Which air purifier brands lead AI recommendation coverage in October 2026?
• Which brand moved the most across the four-month series, and in which direction?

Levoit leads the Air Purifiers benchmark in October 2026 with 86.8% valid recommendation coverage, ahead of Coway's 80.1% by 6.7 percentage points. The largest coverage increase across the series was Coway, rising to 80.1% in October 2026 from 70.2% in July 2026. The largest coverage decline was Dyson, falling to 11.9% in October 2026 from 24.6% in July 2026.

This was a mixed month with movement in both directions. Coway's 7.0-point rise from 73.1% in September 2026 to 80.1% in October 2026 moved beyond normal month-to-month variation, extending a run of gains that began with the series. Dyson's decline continued across the full series, falling in each of the months from July through September 2026 before registering a small 0.4-point increase in October 2026. Austin Air declined in each of the three months since July 2026, with its October 2026 move below its July 2026 baseline. Molekule and Rabbit Air also sit below their July 2026 baselines.

Across the full four-month series, Coway gained in every month, reaching 80.1% in October 2026 from 70.2% in July 2026. Blueair and Winix each rose 3.8 points and 1.5 points respectively across the series. The largest single-month decline in the series was Dyson's 7.9-point drop in September 2026.

The benchmark began with 800 prompt-surface observations in July 2026 and 800 in October 2026, producing 615 and 612 qualified observations respectively.

Current Benchmark at a Glance

Qualified surface breadth counts the canonical AI/search surface families with at least one qualified observation: ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode. Breadth returned to six in September 2026 after ChatGPT was absent from the qualified observations in August 2026, and remained at six in October 2026.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Air Purifiers

Research Scope and Qualification

The public benchmark is narrower than the raw collection universe by design.

Brand-level percentages use the qualified observations as the public denominator, not the raw collection. See the AI Visibility Market Discovery Methodology for details.

Current Brand Standings

Questions This Section Answers

• How did each air purifier brand perform on valid recommendation coverage in October 2026?
• Where did brand-level top-three and rank-one rates diverge from overall coverage?

Sorted by valid recommendation coverage in October 2026.

How to Read the Standings

• Presence rate: Share of qualified observations where the brand is mentioned.
• Valid recommendation coverage: Share of qualified observations where the brand appears in a valid recommendation shortlist.
• Top-three rate: Share of qualified observations where the brand is recommended in the top three slots.
• Rank-one rate: Share of qualified observations where the brand is the first recommendation.
• Net sentiment: Positive minus negative sentiment divided by total mentions, on a -1 to 1 scale.

For formulas and denominator rules, see AI Visibility Market Discovery Metric Definitions.

Recommendation Coverage Movement

Questions This Section Answers

• Why did Coway's recommendation coverage rise while Dyson's fell across the series?
• Which air purifier brands moved beyond normal month-to-month variation?

Largest Increase: Coway

Coway's valid recommendation coverage rose by 9.9 percentage points across the four-month series, moving beyond normal variation. The brand gained in each of the four months since July 2026, reaching 80.1% in October 2026. Its most recent move, from 73.1% in September 2026 to 80.1% in October 2026, was the largest single-month gain in the series and also moved beyond normal variation. Presence rate climbed to 84.6% in October 2026 from 78.7% in July 2026, and top-three rate rose to 69.8% from 52.8% over the same period.

Largest Decline: Dyson

Dyson's valid recommendation coverage fell by 12.7 percentage points across the four-month series, moving beyond normal variation. The brand declined in each of the months from July through September 2026, including the largest single-month drop in the series of 7.9 points in September 2026, before registering a small 0.4-point increase in October 2026 that remained within normal variation. Presence rate fell to 18.3% in October 2026 from 34.6% in July 2026, and top-three rate declined to 3.1% from 7.6% in the same period.

Category Leader: Levoit

Levoit remained the category leader in October 2026 with 86.8% valid recommendation coverage, up 1.1 percentage points from 85.7% in July 2026 and within normal variation for the primary metric. Levoit's top-three rate of 71.4% was the highest in the category, though its rank-one rate of 26.0% fell below Coway's 34.5%.

The remaining brands were stable on the primary metric. Blueair rose 3.8 points across the series, with its most recent move from 62.7% in September 2026 to 68.3% in October 2026 moving beyond normal variation. IQAir rose 4.7 points across the series but declined 6.1 points in October 2026 from September 2026, a month-over-month move that moved beyond normal variation. Winix rose 1.5 points across the series. Honeywell declined 1.4 points across the series, with movement within normal variation.

Recommendation Placement Snapshot

Questions This Section Answers

• How did first-position recommendation rates change for the top air purifier brands?
• Why does coverage alone understate placement differences between brands?

Coverage alone does not show how prominently a brand is recommended. Coway's rank-one rate rose to 34.5% in October 2026 from 19.4% in July 2026 even as Levoit maintained category-leading coverage.

Coway improved both its top-three and rank-one rates from July 2026 to October 2026, and Blueair's first-position rate rose from 10.2% to 14.1% while its top-three rate rose from 41.8% to 53.6%. Levoit's first-position rate declined from 34.8% to 26.0% in the same period. Close coverage can still hide different first-position rates.

Buyer-Intent Distribution

All qualified observations in both months fell into the Brand Recommendation class.

The current public series measures that class of discovery and does not yet contain qualified observations in the empty classes.

Historical Measurement Record

Questions This Section Answers

• Which air purifier brand led AI recommendation coverage in each measurement period?
• What was the largest coverage movement recorded across the series?

This is an evergreen benchmark URL. New measurements are added to the same report.

Evidence and Source Layer

Questions This Section Answers

• What does the AI citation and source data actually show for air purifiers?
• Which domains do AI search surfaces cite most when recommending air purifiers?

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure:

• Market share or sales attributable to AI recommendations
• Every possible AI response, only the qualified observations in the collection
• Organic-search ranking or social mention volume
• Private or sponsored channels
• Causality from a metric movement alone

Top 10 Cited Domains

Across all AI platform responses in October 2026, the benchmark recorded 7,471 citations from 973 unique domains.

Citations are broadly distributed: the top 10 domains account for 46.8% of all citations, with the remaining 53.2% spread across 963 additional domains. One tracked brand's own domain, blueair.com, appears in the top 10, cited 139 times and appearing across all six platform families. Review and testing sites (housefresh.com, rtings.com, consumerreports.org) and general interest sources (youtube.com, reddit.com, forbes.com, nytimes.com) account for a substantial share of citations, while Google's own properties and Amazon round out the top 10.

About This Benchmark

The LLM Authority Index AI Visibility Market Discovery Index tracks how AI assistants and search surfaces discover and recommend brands in a given vertical. The benchmark measures presence, recommendation coverage, placement, and sentiment across six canonical AI surface families.

• AI Visibility Market Discovery Methodology
• AI Visibility Market Discovery Metric Definitions
• AI Visibility Market Discovery Research Standards
• Modeled AI Visibility Authority Value

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