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Clean air at home
อากาศสะอาดในบ้าน
Chiang Mai's air is worst from about February to April, and people want a sensor that shows indoor PM2.5 and a purifier that fits the room.
Today's price ฿2,500
What you get
- Clean air at home฿2,500We choose and place a PM2.5 (fine dust) sensor and an air purifier that fit up to 3 rooms, and plan your filter changes.
How it goes
- We size a PM2.5 sensor and a purifier for up to 3 rooms.Hongdam · Before buying
- We place them in your home.Hongdam · At your home
- We write a filter plan.Hongdam · After placing
- We size a PM2.5 sensor and a purifier for up to 3 rooms.Hongdam · Before buying
- We place them in your home.Hongdam · At your home
- We write a filter plan.Hongdam · After placing
Useful facts
- Chiang Mai's burning season runs about February to April, with March the worst month, and the rains usually arrive in May. Open burning was banned from 1 January to 31 May 2026. thailandstarterkit.com
- Thailand's daily PM2.5 limit is 37.5 µg/m³ and the WHO guideline is 15 µg/m³. On the morning of 1 April 2026 the 24-hour average was 80.3 at Suthep and 110.3 at Chang Phueak in Chiang Mai city, and 286.0 at Muang Na in Chiang Dao. thailandstarterkit.com
- The EPA's sizing table asks for a CADR of 130 for a room of 200 sq ft (about 19 m²) and 195 for 300 sq ft (about 28 m²), worked out for an 8-foot ceiling. epa.gov
- The EPA says manufacturers typically recommend replacing filters every 60 to 90 days. It says CADR covers particles only, and for gases it points to an activated carbon or other gas-removing filter. epa.gov
- Live PM2.5 readings come from IQAir, from Air4Thai (the Pollution Control Department's official network, which shows a 24-hour average) and from Chiang Mai University's DustBoy sensors, which show local changes in real time. thailandstarterkit.com
What others charge
| Xiaomi air purifiers at HomePro, by room size: 27 m²; 42 m²; 60 m² | ฿2,990; ฿4,990; ฿8,990 homepro.co.th |
|---|---|
| Replacement filters for Xiaomi purifiers at HomePro | ฿899–1,939 homepro.co.th |
| Chiang Mai University clean air room | About ฿3,600 per room thailandstarterkit.com |
| Suan Dok Hospital's do-it-yourself purifiers | ฿1,200–1,500 each thailandstarterkit.com |
| Hongdam · Clean air at home | ฿2,500 |
What people ask
When is the burning season in Chiang Mai?
About February to April, with March the worst month. The rains usually arrive in May. Open burning was banned from 1 January to 31 May 2026, outside designated fuel management zones. thailandstarterkit.com
What is Thailand's PM2.5 limit?
The daily limit is 37.5 µg/m³, and the WHO guideline is 15 µg/m³. The page quotes Berkeley Earth's rule of thumb that 22 µg/m³ over a full day is roughly one cigarette. thailandstarterkit.com
What size air purifier do I need?
The EPA's table gives the minimum CADR for a room: 65 for 100 sq ft, 130 for 200, 195 for 300, 260 for 400, 325 for 500 and 390 for 600, for an 8-foot ceiling. For a higher ceiling it points to a cleaner sized for a larger area, and for an open plan it counts the whole space. epa.gov
How often do air purifier filters change?
The EPA says manufacturers typically recommend replacement every 60 to 90 days, and sooner when a filter looks heavily soiled at replacement. It says a dirty, overloaded filter does not work well. epa.gov
How much does an air purifier cost?
At HomePro, Xiaomi purifiers are listed at ฿2,990 for a 27 m² room, ฿4,990 for 42 m², ฿6,790 for 50 m², ฿8,990 for 60 m² and ฿15,990 for 108 m². Replacement filters run from ฿899 to ฿1,939. homepro.co.th
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Weather, air quality or events box for your site
฿4,000
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Plumber, electrician or air-conditioning worker, booked
฿500 / job
We find one, ask for the price before work starts, and book a time.
Someone at your place
฿600 / hour
In Chiang Rai or Chiang Mai, we meet the repair worker or landlord at your place, translate, and check the work.
Price comparison
from ฿1,500
We ask sellers for prices and put them in one list. Our fee is the same whether you buy or not.
Elsewhere
Small print
Prices here move with demand: when most of a month's places are taken, the price goes up a step; when few are, it comes down a step.
Sources read 2026-10-24.