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 pollution levels are relatively high, and the air is more humid. Thus, outdoor air pollution can be more severe than indoors.

Additionally, temperatures in the early morning are low, and suddenly opening windows can cause a drastic drop in room temperature, especially in winter, leading to health issues.

So, it is best to wait until the sun is up to let in fresh air for improved air quality.

2. Avoid Opening Windows During Overcast Skies

When it’s foggy, the concentration of fine dust particles in the air is high, and these particles are harmful to human health. Opening windows during this time can allow these particles to easily enter your home, posing a risk to your family’s well-being.

In such cases, it is advisable to use an air purifier to enhance indoor air quality.

3. Refrain from Opening Windows When Temperatures are Extremely Low

When outdoor temperatures drop significantly, opening windows can let in cold air, making your living space chilly. This can lower your body’s resistance and make you more susceptible to colds.

Therefore, when it’s extremely cold, opt for air conditioning or heating to regulate indoor temperatures instead of opening windows for ventilation.

4. Avoid Opening Windows During High Humidity

During humid weather, walls and floors may ‘sweat’, prompting people to open windows, hoping that the breeze will dry their homes. However, this is a mistake.

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

In such cases, use a dehumidifier or place a charcoal bucket under the bed or in a corner to reduce moisture and maintain a dry home.

5. Avoid Morning and Evening Rush Hours

Opening windows during these times in densely populated cities is ill-advised. 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 substantial vehicle emissions. If windows are open for ventilation, pollutants from these emissions can seep into your home, negatively affecting respiratory and immune systems. The elderly, children, pregnant women, and individuals with chronic illnesses are particularly vulnerable to these pollutants.

Apart from these five periods, there are other scenarios to consider regarding window-opening. For instance, during harsh weather conditions like wind, rain, or snow, opening windows can let in moisture and dust, impacting your indoor environment.

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