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What is…asthma?

A common long-term inflammatory disease of the airways, asthma has numerous symptoms, from wheezing and coughing to chest tightness and shortness of breath. While the condition can’t be cured, and it can be triggered by common allergens and other factors, symptoms can be controlled through regular monitoring, treatment and changes to your home environment.


The basics

Asthma is a condition that causes your airways to narrow and swell, producing extra mucus, which can affect your breathing and trigger coughing and other reactions. For some sufferers, it can affect daily life and even lead to potentially fatal attacks.

Asthma episodes can be set off by a variety of factors, like jogging, cold air, air pollution and allergens, including pet dander. It can often become worse at night. The condition generally can be managed by avoiding triggers and using medications, like inhaled corticosteroids and a variety of other drugs. In severe cases, intravenous corticosteroids, magnesium sulfate and hospitalization may be necessary.

Fast facts

  • In 2015, 358 million people globally had asthma, up from 183 million in 1990.
  • Asthma was recognized in ancient Egypt and treated by drinking an incense mixture called kyphi.
  • Hippocrates officially named the condition as a respiratory condition around 450 BC; the name “asthma” comes from the Greek word for “panting.”
  • Laws that limit smoking have been found to decrease the number of people hospitalized for asthma.


Clear the air

  • Stay current with vaccinations to prevent flu and pneumonia, which may trigger asthma episodes.
  • Identify your asthma triggers, like cold air, pet dander, pollen or air pollution, and take steps to avoid being exposed to them.
  • Regularly measure and record your airflow with a home peak flow meter.
  • Don’t smoke.
  • Act quickly to control your symptoms if you think an attack is coming on.
  • Use a smart air purifier with a HEPA filter, like Coway Airmega, that can help eliminate harmful particles, including pollen and pet dander, likely to trigger your symptoms.


1Coway air purifiers have been proven to trap dust, pollen, dander, viruses and bacteria in the air based on KCL (Korea Conformity Laboratories) testing.They have been tested in a 30㎥ size chamber according to the Korea Air Cleaning Association standard (SPS-KACA 002-132:2022 Modified) to measure the 0.01㎛ size of particle removal rate. It was tested on maximum airflow speed in normal room temperature and humidity conditions. The performance may vary in the actual living environment of customers.
→ Tested with Airmega Aim, 100, 150, 160, AP-1216L, AP-1512HH, AP-1512HHS, 200M, Icon, IconS, 230, 240, 250, 250 Art, 250S, 300, 300S, 400, 400S, ProX

299.97% of viruses, bacteria, fungi and pollen were verified to be removed from the air for Coway air purifiers which have Green True HEPA™ filter applied based on the Japan Food Research Laboratories(JFRL) testing according to JEM 1467 standard.
→ Tested with Coway Airmega AP-1512HH, AP-1512HHS, 250, 250 Art, 250S, 300, 300S, 400, 400S
→ All tested by JFRL and received above result within below time.

All tested by JFRL and received above result within below time.

- Virus: Tested with Escherichia coli phage ΦX174 NBRC 103405, 60 minutes
- Bacteria: Tested with Staphylococcus epidermidis NBRC 12993, 60 minutes
- Fungi/Mold: Tested with Penicillium citrinum NBRC 6352, 60 minutes
- Pollen: Tested with Cedar Pollen extract, 60 minutes

3Aerosol test conducted in a Biosafety level 3 laboratory with two Coway air purifier models, Coway Airmega 250 and 400 for removal of SARS-CoV-2 Aerosol by US based MRI Global, a not-for-profit laboratory and partner of US Department of Defense. The test was conducted in a 13.1ft3 chamber. Virus was aerosolized for 15 minutes and the product was turned on high for 2 minutes. Result showed each product effectively removed over 99.98% of the SARS-CoV-2 in 2 minutes. This is a result from a laboratory experiment condition and result may vary in different conditions. This result does not imply it kills SARS-CoV-2 or prevents the transmission of Covid-19. Coway Airmega 250S and 400S are identical to the tested models and has equal performance with an additional mobile connectivity function.

4The concentration of ammonia, acetaldehyde and acetic acid were proven to be removed within 30 minutes by FCG Research Institute, Inc. Human Life Science Lab. It is not a demonstration result in the actual use space. Not all odors and gases may be supported. → Tested with Coway Airmega 150, 160, AP-1512HH, AP-1512HHS, 400, 400S

5The coverage area of the air purifier is based on an area where the air cleaner can make two air changes per hour (ACPH). An air change per hour translates to how many times an air purifier can clean an area, assuming the height of a ceiling to be 8 ft, in one hour. Therefore ** means two air changes per hour means that the cleaner can clean the area once every 30 minutes and * means air changes per hour means that the air purifier can clean the area once every 60 minutes.

10Terms and conditions apply. Discounts, including promotions, coupons, bundle discount and subscription discount, cannot be stacked on top of other coupons. During promotional periods, discount codes will not be able to be applied to orders. Promo codes may apply to products only—filters, accessories, and new products within 3 months of the release date are not included.