1. Avoid Opening Windows in the Early Morning

In the early morning, before sunrise, plants are still in a state of ‘sleep’. At this time, after a night of ‘rest’, the carbon dioxide levels in plants peak. Therefore, opening windows for ventilation and fresh air at this time is pointless.

This is also when the concentration of air pollutants is relatively high, and humidity is elevated. As a result, outdoor air pollution can be more severe than indoors.

Additionally, the temperature in the early morning is usually low, and suddenly opening the windows can cause a rush of cold air into the room (especially in winter), leading to a significant drop in temperature and potential health issues like catching a cold.

Thus, it is advisable to open windows only after the sun has risen to ensure better air quality.

2. Avoid Opening Windows During Overcast Days

In foggy weather, the concentration of fine dust particles in the air is very high, and these particles are harmful to human health. If you open the windows during this time, they can easily enter your home and pose health risks to your family.

In such cases, it is recommended to use an air purifier to improve indoor air quality.

3. Refrain from Opening Windows When the Temperature is Too Low

When outdoor temperatures drop too low, opening windows can let in cold air, making the room feel chilly. This can lower your body’s resistance and make you more susceptible to catching a cold.

Therefore, when temperatures are extremely low, it is advisable to use air conditioning or heating to regulate the temperature indoors instead of opening windows for ventilation.

4. Avoid Opening Windows During High Humidity

During humid weather, walls and floors may ‘sweat’, and many people mistakenly open windows, hoping that the wind will dry their homes. However, this is incorrect.

When outdoor humidity is high, opening windows can allow moisture to enter the room, increasing indoor humidity. This can lead to mold growth, posing health risks to your family.

In such cases, it is recommended to use a dehumidifier or place a charcoal bucket under the bed or in the corner of the room to reduce humidity and keep the room dry.

5. Avoid Opening Windows During Morning and Evening Rush Hours

Opening windows during these times in densely populated cities is inadvisable. As we know, the morning rush hour is from 7 to 9 am, and the evening rush hour is from 5 to 7 pm.

Traffic volumes are high during these periods, resulting in a significant amount of vehicle emissions. If windows are opened for ventilation, pollutants from these emissions can seep into your home, negatively affecting your respiratory and immune systems. The elderly, children, pregnant women, and individuals with chronic illnesses are particularly vulnerable to these pollutants.

In addition to the above five periods, there are other situations where caution is needed regarding window opening. For example, during harsh weather conditions like wind, rain, or snow, opening windows can let in moisture, dust, and other elements, impacting the indoor environment.

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