Air Purifier Buying Guide: HEPA, CADR, and Smog Protection
With smog seasons and year-round dust, indoor air in many Pakistani cities can be surprisingly polluted — and that’s the air your family breathes most. An air purifier filters out fine particles, allergens, and odours to make your home healthier. But the specs (HEPA, CADR, room size) decide whether a purifier actually works, so here’s what to look for.
What an air purifier removes
- Fine particulate matter (PM2.5) from smog and traffic — the most important during smog season.
- Dust and pollen that trigger allergies.
- Pet dander and some odours (with the right filter).
- Smoke particles from outdoor smog drifting indoors.
The specs that actually matter
1. A true HEPA filter
This is the core of a good purifier — a genuine HEPA filter captures the tiny PM2.5 particles that matter for smog. Avoid vague “HEPA-type” claims; look for true HEPA. A solid home unit is the Certeza AP-240 air purifier.
2. CADR and room size
CADR (Clean Air Delivery Rate) tells you how quickly it cleans the air. Match the purifier’s rated room coverage to your actual room — an undersized unit in a big room won’t keep up. Bigger room, higher CADR.
3. Filter replacement cost
Filters need replacing periodically, so check that replacement filters are available and affordable — this is the real running cost.
4. Useful extras
An air-quality sensor with auto mode, a quiet sleep setting, and a filter-change indicator all add genuine value. Compare options and the current air purifier price in Pakistan.
Air purifier and smog: a combined approach
During heavy smog, a purifier works best alongside other steps: keep windows shut on high-pollution days, run the purifier in the rooms you use most (especially the bedroom), and use an N95 mask outdoors. Indoors clean air, outdoors protected lungs.
How to choose, quickly
- For smog/PM2.5: Insist on a true HEPA filter.
- For a large room: Prioritise a high CADR and matching coverage.
- For the bedroom: Look for a quiet sleep mode.
- For running cost: Check filter price and lifespan before buying.
Frequently asked questions
Do air purifiers help with smog?
Yes — a purifier with a true HEPA filter captures the fine PM2.5 particles in smog, improving indoor air, especially when windows are kept closed.
What is CADR and why does it matter?
CADR (Clean Air Delivery Rate) measures how fast a purifier cleans air. A higher CADR suits larger rooms; matching it to your room size is key to performance.
How often do air purifier filters need replacing?
It varies by model and air quality, but filters are consumables — check the manufacturer’s schedule and keep replacements on hand.
How much does an air purifier cost in Pakistan?
Prices vary by coverage, filter type, and brand. See the current air purifier price in Pakistan for up-to-date figures.
This article is for general information only. If you have a respiratory condition, follow your doctor’s advice on managing indoor air and smog exposure.
