{"meta":{"api_version":"v1","data_status":"verified","category":"air-purifier","category_count":1,"categories":[{"id":"air-purifier","label":"Air purifiers","short_label":"Air purifiers","methodology_version":"air-purifier-v1.0","description":"Exact-model CADR throughput, conservative CADR per checked pound, raw pollutant basis and visible source conflicts.","ranking_basis":"CADR-led specification comparison of exact UK manufacturer offers. Raw pollutant bases remain visible and mixed-basis values are not presented as laboratory-equivalent.","product_count":20,"ranked_count":20,"in_stock_count":18,"checked_at":"2026-07-29T17:17:15.937Z","offer_observation_window":{"oldest_checked_at":"2026-07-29T17:17:15.937Z","newest_checked_at":"2026-07-29T17:17:15.937Z"},"observed_in_stock_receipt_count":18,"fresh_offer_count":20}],"market":"GB","evidence_checked_at":"2026-07-29T17:17:15.937Z","offer_observation_window":{"oldest_checked_at":"2026-07-29T17:17:15.937Z","newest_checked_at":"2026-07-29T17:17:15.937Z"},"generated_at":null,"trace_schema_version":"evidence-trace-v1.0","claim_level_trace_count":2,"readiness_schema_version":"recommendation-readiness-v1.1","readiness_profile_count":160,"leading_readiness_profile_count":40,"identity_exclusion_count":1,"product_count":20,"ranked_count":20,"fresh_offer_count":20,"in_stock_count":18,"observed_in_stock_receipt_count":18,"ranking_basis":"CADR-led specification comparison of exact UK manufacturer offers. Raw pollutant bases remain visible and mixed-basis values are not presented as laboratory-equivalent.","freshness_policy":"Use checked_at on each offer, image and review source. Response time is never evidence freshness.","warning":"Scores compare traceable published specifications, checked prices and review evidence within one category. They are not laboratory measurements and are not comparable across categories. Availability may have changed after checked_at.","review_policy":"Review pools are deduplicated and trust-adjusted. A single retailer pool is labelled limited and is not internet-wide consensus.","commercial_policy":"Offer links currently resolve directly through an attributable redirect. 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