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Qubo Q600 (₹14,999) is best for severe Delhi pollution with CADR 450 m³/h. For budget-conscious buyers, Xiaomi Smart Air Purifier 4 Lite (₹12,999) offers excellent CADR 360 with app control. Both handle AQI 300-500 effectively. Choose Xiaomi if you want smart features, Qubo for maximum raw air cleaning power.

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Formula: (Room Area in sq ft × Ceiling Height in ft × 5) ÷ 60 = Required CADR. For a 300 sq ft room with 10 ft ceiling: (300 × 10 × 5) ÷ 60 = 250 CADR minimum. Choose higher CADR for faster cleaning or high pollution areas. Our guide section provides ready calculations.

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Both capture 99.97% of particles ≥0.3 microns. "H13 HEPA" explicitly confirms EN 1822 certification standards, while "True HEPA" follows same specs but may use different naming. Functionally identical for home use. Avoid "HEPA-type" or "HEPA-like" claims - these are marketing terms for inferior filters capturing only 85-90% particles.

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Typical Costs: Xiaomi filters: ₹2,999 (6-12 months), Sharp: ₹3,500 (12-18 months), Honeywell: ₹2,499 (6-12 months), Philips: ₹3,999 (12-18 months). Replacement frequency depends on usage hours and pollution levels. Delhi/NCR needs replacement every 6-9 months, moderate cities 12-18 months. Budget ₹3,000-5,000 annually.

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Buy smart (Xiaomi, Qubo) if: You want scheduling, remote control, air quality monitoring, or voice control. Buy manual (Sharp, Honeywell, Philips) if: You prefer simple operation, don't need connectivity, or want to save ₹2,000-3,000. Air cleaning performance is similar - smart features are convenience additions, not essentials.

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Not recommended. Third-party filters often lack proper sealing, reducing effectiveness and allowing unfiltered air bypass. Cheap filters may have lower HEPA grade (85-90% vs 99.97%). Genuine filters guarantee exact fit, certification, and warranty protection. False economy that compromises health benefits.

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High pollution (AQI 150+): Run 24/7 on auto mode. Moderate pollution (AQI 50-150): Run 8-12 hours daily, especially during sleeping hours. Low pollution: 4-6 hours when occupied. Use auto mode to let the purifier adjust speed based on real-time air quality. Power consumption is minimal (30-60W).

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Best service: Philips, Sharp (established networks nationwide). Good service: Xiaomi (app-based support, good in metro cities). Developing: Honeywell, Qubo (improving but limited in Tier 2/3 cities). Check local service center availability before purchase. For most issues, filter replacement solves problems - genuine online availability matters more than physical service centers.

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No. Air purifiers cannot clean incoming outdoor air fast enough with open windows. Effectiveness drops 60-80% with windows open. Close all doors and windows during operation. For ventilation, open windows when outdoor AQI is good (below 50), turn off purifier during this time, then close and restart purifier.