Best Air Purifier for Haze in Singapore: A Sizing Guide

Why Haze Is a Job for H13 HEPA

Haze in Singapore is smoke from regional land and forest fires drifting over. The fraction that matters for your health is PM2.5 — particles fine enough to penetrate deep into the lungs, and small enough to seep indoors through door gaps and ventilation openings even with the windows shut.

Singapore's haze advisories recommend staying indoors with windows closed and running an air purifier when air quality reaches unhealthy levels. That makes the purifier the working end of your haze plan — and filter grade decides how well it works.

H13 is defined under EN 1822 as capturing at least 99.95% of particles at the most-penetrating particle size. Every AIRE room purifier uses H13 medical-grade HEPA as standard, capturing at least 99.95% of particles down to 0.1 micron — well within the PM2.5 range. Our 7-layer stack also includes an activated carbon layer, which matters during haze because the burnt smell comes from gases that no HEPA filter can trap.

Haze in Singapore Now: October 2026

Updated 11 October 2026. The 2026 haze season moved from Moderate to Unhealthy within a week. NEA reported a 24-hr PSI of 73–96 (Moderate) on 4 October, 102–135 (Unhealthy) on 6 October, and 135–192 (Unhealthy) at 6pm on 9 October. At 6pm on 11 October it was 112–155, still Unhealthy, with 1-hr PM2.5 at 39–111 µg/m³ (Band 1 to Band 2), and NEA forecast the Unhealthy range to continue.

Readings change by the hour, so check live figures on haze.gov.sg. NEA's own rule of thumb: use the 1-hr PM2.5 reading for what you do right now, and the 24-hr PSI forecast to plan ahead.

Our practical advice: once the PSI is in the Unhealthy range, close windows and run a correctly sized purifier continuously in every room people are using, starting with the rooms you use most.

How to Size a Purifier for Haze: The CADR Method

Ignore the discount-ranked listicles. The only question that matters is whether a unit moves enough clean air for your room. The maths is simple:

Required CADR (m³/h) = floor area (m²) × ceiling height (m) × target air changes per hour (ACH). Aim for 3–4 ACH at home, 4–5 in offices, and 5 or more in clinics.

The examples below assume a typical 2.6 m ceiling — measure yours if it differs.

• HDB bedroom (about 12 m²): 12 × 2.6 × 4 ≈ 125 m³/h
• HDB living-dining area (about 30 m²): 30 × 2.6 × 4 ≈ 310 m³/h
• Open-plan office zone (about 60 m²): 60 × 2.6 × 5 = 780 m³/h

Buy headroom, not the bare minimum. A unit rated well above your requirement can hold the same air quality on a lower, quieter fan speed — which matters when it runs day and night through an episode.

Quick Sizing Table: Room Area to CADR

The numbers below use the CADR method from the section above: floor area × 2.6 m ceiling × 3–4 air changes per hour. Measure your room and use the row for your exact area or the next larger one, then pick a unit that meets at least the lower figure.

Higher ceilings need proportionally more: multiply by your real ceiling height instead of 2.6 m. For a quick answer, use the air purifier size calculator.

Matching AIRE Units to Typical Singapore Rooms

Here is how our range maps to common Singapore room sizes. All three room units use the same H13 medical-grade HEPA as standard, and AIRE pairs H13 filtration with active UV-C and copper-silver ion sterilisation — useful year-round, not only in haze season.

Two more options round out a household plan. The Reno 500S (20–40 m²) is our home unit with a whisper-quiet sleep mode and child-safe design — a natural fit for nurseries and bedrooms. The KJ100F desktop unit adds personal H13 True HEPA coverage at a work desk.

Check noise before you buy, because during haze the machine never switches off: the Fillo Plus stays under 53 dB, the Classic 400S runs 30–55 dB across eight speeds, and the Pro 800S drops to 26 dB in sleep mode.

Getting Through an Episode: Placement and Habits

A purifier cleans the room it sits in — nothing more. Keep these habits through an episode:

• Close windows and doors. Every open gap re-loads the room with PM2.5 faster than the machine can clear it.
• One unit per occupied room. A single purifier in the living room does nothing for the bedrooms. Move the unit with you, or cover each room you actually use.
• Run it continuously. Clean air decays quickly once the fan stops while outdoor PM2.5 is high. Use auto mode by day and sleep mode at night.
• Mind the aircon. Recirculating aircon works fine alongside a purifier; just avoid fresh-air intake modes while outdoor air is unhealthy.
• Check filters afterwards. Haze loads filters far faster than normal weeks. Inspect the pre-filter and replace consumable filters earlier than the usual schedule if they look heavily loaded.

Buy or Rent — but Size It Before the PSI Climbs

The worst time to shop for a purifier is mid-episode, when retail stock runs low and rental fleets book out. Sort your rooms out while the air is still clear.

We are a Singapore brand serving homes, offices, clinics and childcare centres island-wide, and we deliberately keep both routes open: buy outright, or take flexible rental for the haze period without committing to ownership. Either way, start with our Air Report — your rooms sized in writing, then buy or rent.

If you want a recommendation for your exact floor plan, WhatsApp or call us on +65 8082 3699 with your room sizes and we will map units to rooms for you.

Frequently asked

What CADR do I need for an HDB living room during haze?

A typical HDB living-dining area of around 30 m² with a 2.6 m ceiling needs roughly 310 m³/h to achieve 4 air changes per hour. The Classic 400S (CADR 480 m³/h) covers this with headroom to spare, so it can hold air quality on quieter mid speeds.

Will an air purifier remove the burnt smell of haze?

The smoky odour comes from gases, which HEPA filters cannot capture. You need an activated carbon stage — included in AIRE's 7-layer filtration stack — plus closed windows to stop new smoke entering. Expect the smell to fade steadily rather than vanish instantly.

Should I run my purifier 24 hours a day during haze?

Yes, in any room that is occupied. Once the fan stops, PM2.5 seeping in from outside rebuilds quickly. — and the Classic 400S and Pro 800S have sleep modes to keep night-time noise low, while the Fillo Plus runs under 53 dB.

Can I rent an air purifier just for the haze season?

Yes. We offer flexible rental across Singapore, so you can equip a home or office for the haze period without buying. Arrange it before an episode starts — rental fleets book up quickly once the PSI rises.

What is the difference between the PSI and the PM2.5 reading?

NEA publishes both: the 24-hr PSI with its forecast, and the 1-hr PM2.5 reading. NEA advises using the 1-hr PM2.5 for immediate activities and the 24-hr PSI forecast to plan ahead.

When should I switch on an air purifier during haze?

Our practical advice: when the 24-hr PSI reaches 101 or above (the Unhealthy range), close windows and run a correctly sized purifier continuously in the rooms you use.

Which AIRE unit suits a bedroom during haze?

The Fillo Plus (CADR 300 m³/h, H13 HEPA) is listed for rooms up to 30 m². In a 30 m² room with a 2.6 m ceiling it gives about 3.8 air changes per hour; for a full 4 ACH, or for rooms of 31–54 m², choose the Classic 400S (CADR 480 m³/h).

Related reading

• Air Purifier Rental for Haze Season in Singapore
• Haze Season Prep for Preschools and Student Care in Singapore
• What Is CADR? Air Purifier Ratings Explained

Part of the guide: Haze season in Singapore: sizing, rental and preparation — 1 more guides on this topic.