Keep Windows Closed With Air‑Conditioning On in Dog Days! Beware of Invisible Indoor Air Hazards

As the Dog Days arrive, sustained high temperatures hit many parts of the country. People stay in air‑conditioned rooms for long hours to escape the heat, keeping doors and windows shut all day long for better cooling performance.

Most people only care whether the air conditioner delivers sufficient cooling, yet overlook one critical fact: various indoor air pollutants are quietly building up in sealed air‑conditioned spaces.

High temperatures accelerate the release of volatile substances such as formaldehyde and TVOC from furniture panels. For every 8 °C rise in temperature, formaldehyde emission rate nearly doubles. Meanwhile, the damp interior of air‑conditioners is highly prone to bacterial and mold growth, which spreads to every corner of the room along with cold airflow.

Many people have had this experience: after staying in an air‑conditioned room for a long time, they feel unexplained dizziness and drowsiness, accompanied by dry itchy throat and sneezing. Symptoms ease once they leave the room. This may not simply be “air‑conditioner sickness”; very likely, it is caused by bacteria and volatile contaminants in indoor air.

Opening windows for ventilation is certainly the lowest‑cost way to improve air quality. However, opening windows at scorching noon means letting sweltering heat indoors. Frequent window ventilation is also impractical in many scenarios such as offices, meeting rooms and hospital wards.

Consequently, many households purchase air purifiers, yet there exists a major misconception: ordinary air purifiers can only filter particulate matter, which does not equal disinfection and sterilization.

Conventional HEPA‑filter purifiers work by passively trapping dust and particulates in the air. Bacteria and viruses are merely intercepted on filter screens. If filters are not replaced for extended periods, microorganisms will breed on them and cause secondary pollution. Such devices possess no capacity to inactivate bacteria or viruses.

To achieve genuine air disinfection, opt for compliant and filed disinfection products — air purification‑disinfection machines. There are essential differences between the two categories.

How to identify a qualified air disinfection machine? Keep these key criteria in mind:

• Class‑II disinfection product with filing records accessible on the National Online Filing Information Service Platform for Disinfection Products, together with complete health‑safety evaluation reports;

• Clearly‑defined disinfection factors, distinguishing technical routes such as ultraviolet ray, ozone and plasma;

• Ozone leakage complying with national standards, supporting human‑machine coexistence and allowing operation while people stay indoors;

• Authoritative third‑party CMA test reports with explicit data on bacteria and virus killing / removal efficiency.

Today we introduce DBD plasma air disinfection technology, an air‑sanitizing solution increasingly widely adopted in hospitals and workplaces.

Plasma technology differs from ultraviolet and high‑concentration ozone disinfection. Ultraviolet disinfection requires people to leave the premises during operation; excessive ozone irritates respiratory tracts and is unsuitable for simultaneous human presence.

Plasma generates high‑energy ion clusters to actively inactivate airborne suspended bacteria and viruses without relying on filter interception. The unit may operate without built‑in UV lamps or medium‑to‑high‑efficiency filters, conforming to WS/T 648‑2019 General Hygienic Requirements for Air Disinfectors.

Take the Kangbeijing KJ‑15BA Plasma Air Disinfector as an example. As a compliant Class‑II disinfection product, its filing records are available for inquiry on the National Online Filing Information Service Platform for Disinfection Products.

✅ Mobile and tool‑free for immediate deployment, ready for bedrooms, offices and consulting rooms; ✅ Circulating air volume ≥ 960 m³/h, suitable for spaces ≤ 120 m³; ✅ Rated total power ≤ 85 W, low power consumption for long‑hour continuous operation; ✅ Rigorously‑controlled ozone leakage ≤ 0.003 mg/m³, far below national limits to realize human‑machine coexistence; ✅ Third‑party test reports show 60‑minute killing‑removal rate of 99.95%‑99.99% against Staphylococcus albus, Klebsiella pneumoniae and coronavirus; ✅ Intuitive screen display for temperature, humidity, airflow speed and disinfection countdown; with alarm functions for filter expiry, fan fault and plasma module failure; ✅ Multiple control modes: manual, programmed and remote control, fit for both residential and public‑site applications.

A frequently‑asked question: Does having a disinfection machine mean we can stop opening windows entirely?

Definitely not. Air‑disinfection equipment serves as an auxiliary protective measure and cannot fully replace ventilation. Where conditions permit, short‑term window ventilation for 15‑20 minutes every 1‑2 hours is still recommended. Combined with disinfection‑machine operation, it delivers dual protection for indoor respiratory health.

Final Remarks:

Invisible and intangible indoor air pollution in summer tends to be ignored.

When selecting air‑handling equipment, do not fall for mere “purification” marketing gimmicks. If disinfection and sterilization are required, prioritize disinfection products filed with national health authorities. Verify filing documents and test reports to avoid paying for over‑hyped products, and take invisible air safety under your control.