Don't get sick.
Get a HEPA.
Air Purifier Buying Guide
The 6 Best Air Purifiers in China 2019
Best Smart Air Purifiers
Xiaomi Mi Air Series
Xiaomi Mi Air 2S / 3
Up to 37 sqm : medium room
Cost: ¥799 Filter Life: 4 months Replace: ¥150+
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Xiaomi Mi Air Pro / H
Up to 60 sqm : small apartment
Cost: ¥1299 Filter Life: 2.5 months Replace: ¥150+
> More Info
Nov 2019 Update: We downgraded our Smart Air Recommendation due to pricing changes & new products
Best Multi-Room Air Purifiers
Smart Air BLAST Series
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I kept getting weird headaches & felt so sleepy. My roommates said the same thing. We figured out the common thread: the smog. We each bought an air filter and now we all agree we sleep better, headache-free.
- Jamie, Shanghai
How to Choose an Air Purifier
in 3 Easy Steps
Step 1: Measure
Measure your space(s) to determine the square footage / square meterage. Length x Width
Larger homes often need multiple filters. Smaller rooms can share a large device
Prioritize filtering bedrooms and any space you spend significant time in.
Bedrooms: You sleep 1/3 of your life
Sleep Better: A bedroom air purifier can also help you sleep longer, deeper and increase REM sleep.
Allergies, Asthma & Kids: Children, asthmatics and anyone with environmental allergies will benefit as well as anyone irritated by using AC overnight.
Living Spaces: The other 2/3 of your life
Living Rooms: A logical spot for a larger air purifier is the family living room in a spot with good air flow.
Offices / Workspaces are more difficult to filter: Higher ceilings, HVAC ventilation, more foot traffic If possible, use a high-grade unit to compensate.
Choose smaller air purifiers for each room
Choose a larger air purifier for several rooms
Step 2: Round Up
Choose a device (or combo) that can cover MORE than your space. Inflating your measurements by 10-30% should give a better estimate for real-world use.
Coverage estimates are based off CADR - Clean air delivery Rates; tests done in sealed labs with new filters running on max speed. In real life: max speeds are too noisy, air pollution constantly leaks in, rooms have poor airflow & filters slowly clog.
It's just physics, no matter how well designed, high fan speeds are loud. Stronger Purifiers can operate on quieter, lower speeds.
Pollution levels constantly fluctuate. Stronger devices can scale up or down their filtering to cope with air pollution spikes (Airpocalypse!).
Running on higher speeds rapidly burns through filter life. Using a stronger device can allow filters to last longer, saving time & money.
99% of the time you will NOT be using max speed… Most machines’ max speeds are far too noisy..."
"You want a higher airflow than you really need, so you can use the machine at a quieter level and still get effective airflow.“
Stronger Air Purifiers...
Step 3: Choose Device(s)
Do I need an Activated Carbon Filter?
To carbon or not to carbon... Short answer? HealthyShenzhen recommends using carbon if you can afford it, as carbon can neutralize many toxic gases like VOCs.
In reality the science of how carbon interacts wiht thousands of differnt types of m
The only downside is carbon filtration can decrease airflow as the filter is 'thicker'. This is why Smart Air doesn't automatically include carbon filtration. Xiaomi's 2-in-1 filters have carbon built in but also have shorter lifespans.
6 Best Air Filters 2019 - Full Reviews
You can find literally dozens of brands selling air purifiers in China. Howevor, testing shows many are poor quality. Meanwhile other brands are effective but massively overpriced; Philips, Blue Air & IQair devices are over-engineered, often costing over 2-10,000rmb. Yet, quality devices can be bought for as little as ¥230.
After reviewing dozens of models, only two brands met quality expectations , had good reputations and featured reasonable prices. Smart Air and Xiaomi.This list is reviewed quarterly.
Why good choices ?
"Clean Air should not be a Luxury" is Smart Air's mission. Their no-gimmick purifiers are ultra-budget friendly both for initial price & ongoing costs. Smart Air HEPA filters are cheap to replace and have long lifespans. Smart air, based in Beijing, is a social enterprise devoted to bringing clean air to all.
Xiaomi offers integrated Smart Air purifiers at a lower cost than competitors. A standard 2-in-1 filter is used for most models and the MiHome App enables remote monitoring and control. Xiaomi is a well-known Chinese manufacturer of all things tech: toothbrushes to phones.
Why Choose HEPA* filters?
*High-Efficiency Particulate Air
Genuine HEPA filters are proven to filter out 99.97% of pollution, dust, mold & allergens.
Hospitals, airplanes and even space stations have used HEPA technology for over 70 years.
HEPA Purifiers are cheap, easily available and use as much electricity as a lightbulb.
Unsafe Technologies Include:
X Electrostatic filters do work, but not good enough to clean China's thick dirty air.
X Ionization filters can work but they can also create dangerous by-products toxic ozone gas.
X HEPA-style, HEPA-like & HEPA-silent filters are often lower-quality filters (fakes)
Smart Air Blast Review
Smart Air Blast Mini Review
Smart Air DIY 1.1 Review
Smart Air DIY Cannon Review
Xiaomi Air Purifier 2s Review
Xiaomi Air Purifier Pro Review
Phillips Air Purifier Models: AC5660, AC5630, AC3259, AC3231, AC4074, AC4001, AC4076, AC4012, AC4000, AC2887, AC2831, AC2882, AC2830
Molekule Air Purifier, Blue Air Purifiers, IQAir Purfifers
General Air Pollution
PM2.5 & Air Pollution
VOCS & Air Pollution
NO2 & Air Pollution
SO2 & Air Pollution
Ozone & Air Pollution
Carbon Monoxide & Air Pollution
How to Choose An Air Purifier
HEPA Filters & Air Pollution
Air Quality Index
Shanghai Air quality
Beijing Air Quality
Guangzhou Air Quality
Shenzhen Air Quality