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Always Sick? You May Have a Weak Immune System. Here’s Why and How to Fix It.

Learn how your immune system is weakened by poor air quality, and the best way to combat it.

By Lee Min | May 3, 2024 | 9:30 am GMT +8

Woman resting on sofa with a cold, surrounded by illustrated germs.

Despite our best efforts to stay healthy, everyone gets sick from time to time. But when it comes to getting sick, we are not the same. Some people get sick more often than others. Our immune system is amongst the key factors determining how often we get sick. A weakened immune system can compromise the body's ability to fight against harmful bacteria, viruses, and pathogens, which makes us more susceptible to diseases, illnesses, and infections, and get sick more often.

Indoors, where we spend around 80 to 90% of time and air pollution levels are often 2 to 5 times higher than ourdoor levels according to the EPA, poor air quality has a detrimental effect on our immune system. Therefore, it is important to learn about the negative effects of poor indoor air quality on our immune system and, thus, overall health, as well as the best way to deal with it effectively.

How poor air quality affects your immune system

When the indoor air quality is poor, you are exposed to harmful air pollutants which can severely affect your lung, respiratory system, nervous system, and immune system. This can lead to problems such as:

Skin diseases: Air pollutants such as particulate matter PM 2.5, tobacco smoke, and volatile organic compounds (VOCs) can cause persistent oxidative stress and inflammation to the immune system, leading to immune-mediated diseases such as skin aging, eczema, psoriasis, acne, and skin cancer.

Autoimmune diseases : PM2.5, PM10, and VOCs are some of the harmful air pollutants that can greatly increase the risk of autoimmune diseases such as rheumatoid arthritis (RA), connective tissue diseases (CTDs), and inflammatory bowel diseases (IBDs).

Asthma exacerbation: Certain indoor air pollutants such as dust mites, mould, pollen, pet dander, insect debris and droppings are well known triggers that can worsen symptoms of asthma.

Indoor allergy symptoms: Common indoor air pollutants such as dust mites, pet dander, mould spores, pollen, skin flakes, gases, VOCs, and PM2.5 can trigger a variety of indoor allergy symptoms (allergic rhinitis) like sneezing, runny nose, coughing, sore throat, sinus, and itchy eyes.

Poor sleep quality: Recent studies show exposure to indoor allergens can cause allergy symptoms and sleep disorders, leading to poor sleep quality, which negatively impacts the immune system.

Common indoor air pollutants that affect the immune system

Dust Mites

Mold Spores



Pet Dander

Skin Flakes


PM2.5 & PM10



Benefits of an air purifier for your immune system

A high-quality air purifier like the Sterra Moon Air Purifier can effectively remove all common air pollutants and allergens from the air, helping to combat diseases and symptoms that affect the immune system.

Person scratching an arm with a rash.

Prevents skin diseases

The Sterra Moon Air Purifier can effectively capture air pollutants such as PM2.5, smoke, and VOCs to help prevent immune-mediated skin diseases.

'Woman experiencing wrist pain, holding her wrist with a pained expression.'

Prevents autoimmune diseases

The Sterra Moon can remove air contaminants such as PM2.5, PM10, and VOCs to help combat various autoimmune diseases such as RA, CTDs, and IBDs.

Woman using an inhaler, possibly for asthma, with a concerned expression.

Controls asthma symptoms

The Sterra Moon can help provide relief from asthma symptoms by removing dust mites, mould, pollen, pet dander, insect debris and droppings.

Woman sneezing into a tissue while sitting on a couch.

Relieves allergy symptoms

The Sterra Moon can capture all harmful pollutants such as dust mites, pet dander, mould spores, pollen, skin flakes, gases, VOCs, and PM2.5 to relieve all indoor allergy symptoms (allergic rhinitis).

Improves sleep quality

The Sterra Moon can remove all indoor allergens to relieve allergies and sleep disorders, helping your immune system repair itself through good night sleep.

Strengthening the immune system, made affordable


Sterra Moon Air Purifier

Designed by air quality experts

Unique medical-grade filtration system

Affordable with powerful specs

Improves your sleep, skin, and health

Best air purifier that offers most value

Unique filtration system for improved skin health

The Sterra Moon uses the Triple Layer Medical Grade True HEPA-13 system - a unique and powerful filtration system with 3 specially designed layers that are even used in hospitals to keep the air clean.

Patented pre-filter

Patented filter fabric sieves out the largest pollutants first from the air such as hair, dust, lint, and animal fur. Also helps extend the life span of the primary filter layer.

Activated carbon layer

Extremely porous pieces of carbon that absorbs air contaminants and neutralises odor in the air such as smoke, pet smells, cooking smells, etc.

True HEPA-13 filter

Traps 99.97% of all airborne contaminants including viruses and bacteria that are 0.3 μm small. It also blocks allergens such as pollen, animal dander, dust mites, and more.

Sterra's unique combination of protection removes 99.97% of indoor air pollutants to provide you with cleaner air, stronger immune system, better sleep, and improved overall health.

Captures 99.97% of all indoor air pollutants

Dust Mites

Pet Dander




Mold Spores


PM2.5 & PM10


And Others

Proven to work by multiple studies

Here are some studies that show an air purifier with advanced filtration systems like Sterra Moon can greatly improve indoor air quality and relieve allergy symptoms, which in turn repairs and strengthens the immune system and improves your overall skin health:

Smart technologies for daily ease of use

The Sterra Moon Air Purifier comes with a variety of additional smart technologies and features to help you operate it with ease and peace of mind knowing the air in your home is always clean.

Advanced UVC light technology

Targets and inactivates airborne mold spores, bacteria, and viruses to reduce levels of allergens and pathogens and minimize triggers of allergy problems.

Real-time air quality tracking

Measures your air quality in real time and displays different colors on built-in LED indicator ring accordingly to indicate if your air is clean or dirty.

Whisper-quiet operation

Can operate at whisper-quiet noise level of 20dB on low fan speeds to provide white noise to improve your sleep quality and immune system repair process.

Mobile app control

Included Sterra mobile application comes packed with plenty of handy and nifty features to make operating the air purifier everyday truly a breeze.

Easy to change & long-lasting filter

Changing the air filter is designed to be easy as changing batteries in a remote control. Unlike other air filters that last for a month, Sterra Moon air filters can last up to 6 months.

Get great results with no risks

Get the Sterra Moon air purifier to greatly strengthen your immune system with no risks

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Sterra Moon™ True HEPA-13 Air Purifier



Reduce immune diseases and allergies, improve your sleep quality, and strengthen your immune system today. No risks. Money-back guarantee!


Removes 99.97% all air pollutants

Reduces skin aging, acne & more

Improves sleep & immune system

Relieves asthma & allergies


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Don't take our word for it... Check out the Sterra Moon Air Purifier. You'll see hundreds of customers who were suffering from immune diseases and allergies... Yet, finally, they tried Sterra and never looked back.


Sterra Moon Air Purifier


4.9 | 785 Reviews

Reduces immune diseases, asthma and indoor allergies

Captures 99.97% of all harmful pollutants and allergens

Improves sleep quality, strengthens immune system

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