The Orange Alert Went Up This Weekend — How Long Has It Been Since Your Family Opened A Window?

1. Much of the northern sky turned gray this weekend

From November 1, weak pressure fields and deteriorating dispersion conditions brought the first large-scale pollution episode of the season:

l Zaozhuang, Shandong: issued an orange heavy-pollution alert at 15:00 on November 1, activating a Level II emergency response at 18:00 on November 2;

l Wenshang, Shandong: notified by the city that a pollution episode would hit the Beijing-Tianjin-Hebei region and surrounding areas, raising a matching orange alert;

l Liaoyuan and Lishu, Jilin: yellow haze warnings — visibility below 3,000 meters and PM2.5 above 150 μg/m³;

l Beilin District, Suihua, Heilongjiang: an orange haze warning, with visibility below 2,000 meters, locally below 500 meters.

Public-protection measures in the emergency responses read the same everywhere: children, the elderly, and people with respiratory conditions should avoid outdoor activity; primary schools and kindergartens should suspend outdoor activities.

2. The official advice, translated into household language, is: keep the windows shut

During heavy pollution, the recommended posture at home is windows closed. But the problem arrives with the advice —

Once the windows close, the room becomes a semi-sealed space: cooking fumes, everyone's breathing, slow emissions from furniture, and PM2.5 seeping through door gaps all stay inside. Not much outdoor pollution gets in — but the indoor staleness can't get out either.

Closing the windows is right. Closing the windows alone is not enough.

3. Four ways to use the KJ-15BA on heavy-pollution days

l Dual-duct whole-home circulation in 3 minutes: with no cross-ventilation possible on haze days, the whole-home "internal circulation" does the work — covering living room and bedrooms in turn, leaving no corner out;

l Composite filter captures particulates: PM2.5, dust, and pollen are physically intercepted by the filter, while the activated carbon + potassium permanganate composite filter handles odors and gaseous pollutants — and the filter itself is non-toxic with no secondary release;

l Safe for occupied rooms, around-the-clock operation: DBD plasma technology (rated 99.99% inactivation of bacteria and viruses, manufacturer's laboratory data) acts on air and surfaces — the days when the whole family is shut indoors are precisely its working hours;

l AIoT remote monitoring: check the home's data on the app on the way home from work, and let it "rinse" the air before you arrive.

4. Three household rules for heavy-pollution days

First, skip the outdoors when you can. Especially for children and the elderly — simply follow the official advisories during alert periods.

Second, "closed windows + purifier" is a combo, not a either-or choice. Closed windows keep outdoor pollution out; the equipment handles what accumulates inside. Only the two together work.

Third, don't assume the all-clear means all done. After a pollution episode ends, particles deposited on furniture and fabrics re-suspend slowly. Letting the unit run an extra day or two costs nothing.

Closing thoughts

We can't manage the weather, and we wait for notices on the alerts — but the few dozen cubic meters of air inside your home are yours to decide. There will very likely be another pollution episode this winter. When the next alert sounds, may your home already be ready.