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Preface
In life, doctors will ask patients to "open windows for ventilation" to breathe fresh air, decoration companies will advise customers to "open windows for ventilation" to put a new house aside, and even the elderly will often "open windows for ventilation" to soothe their mood.
The so-called "open window ventilation" is actually to use the principle of air flow to reasonably exchange indoor and outdoor air, so as to help the human body breathe better.
However, "open windows for ventilation" can have adverse effects on the body if it is not reasonable.
So when is it not appropriate to open the windows for ventilation?
Watch out for exhaust fumes!
Although the exact time of the morning and evening rush hours varies from place to place, in general, we generally agree that the morning peak refers to 7 am to 9 am, and the evening peak is between 5 pm and 7 pm.
During the morning rush hour, when people are busy going to work and school to earn money, and during the evening rush hour, they are in a hurry to go home to reunite with their families, so it can be said that the traffic during these two times will be the most congested time of the day in a city.
Although the country has already achieved limited travel, the mainland is a country with a huge population base after all, and there are countless vehicles coming and going every day and night.
There is no doubt that too many vehicles will cause a lot of air pollution.
According to relevant investigations, there are large amounts of carbon monoxide, hydrocarbons, sulphur dioxide and solid particulate matter in the exhaust gases emitted by automobiles.
These chemical gases produce a chemical reaction at the moment of gasoline combustion, and then are emitted into the air by cars, which greatly enhances the earth's greenhouse effect.
Especially in international metropolises such as Beijing and Shanghai, such pollution has increased rather than decreased.
As far as Beijing is concerned, the environmental situation has also been getting worse in recent years, with severe smog and sandstorms appearing from time to time.
Imagine that it is already in the morning and evening rush hour, and the roads are full of sand and dust, and there are many pollutants hidden in the invisible air.
If we open the windows for ventilation at this time and exchange the indoor air with the outdoor air, it will not really "lure the wolf into the room".
If the air contains only sand and dust, then forget it, but there are also a large number of chemical gases, these chemical gases have a great impact on the human body, and the human body is likely to bury the risk of disease after inadvertently ingesting it.
Therefore, in order to better ensure the safety of the family and strangle the external pollution in the cradle, it is still very necessary to close the doors and windows during the morning and evening rush hours.
Beware of unknown substances!
After a hearty heavy rain, we always feel that the air has become fresher.
In fact, rainy days do help to eliminate pollutants from the air.
When it rains, rain can remove dust from the air, and after the dust is gone, we will naturally feel that the air quality is improved.
However, this is based on the situation when the rainfall is heavier.
When the rain is heavy, it is easy to settle pollutants in the air, such as PM10, which is known as PM10, and the amount in the air will decrease rapidly after heavy rain.
However, when the rainfall is small and the rainfall is short, it is difficult to purify the air in this way on rainy days.
If the wind speed happens to be low at this time, the pollutants will be confined to the area and will not take advantage of the dissipation of the pollutants.
In addition, the rain is not as clean as we think, we see it clean, but in fact, it contains many unknown substances.
Everyone must have heard of "acid rain".
After factories and enterprises emit a large amount of polluting substances, these unknown wastes are discharged into the air, and the atmosphere is forced to absorb toxic substances, and if they are not discharged in time, it forms a meteorological disaster of acid rain.
In some cases, even though acid rain has not yet occurred, the amount of acidic substances in the raindrops is still very high.
Imagine if we open the windows at this time to let us in, the raindrops in the air will bring these extremely harmful acids into the room.
These acids may not be volatile for a short period of time, so they slowly wander around the house, and the human body can easily absorb such undesirable substances.
If there are elderly people at home, families need to pay attention. On rainy days, the climate is very humid and the air contains plenty of moisture, so if there are elderly people or rheumatists in the house, it is necessary to close the doors and windows tightly.
Beware of contamination!
Today's factories are in full swing, but there are still some businesses that are lucky enough to release their own pollutants directly back into nature.
Such an action would undoubtedly provoke public outrage.
It is they who make the money, but it is the whole of nature that suffers, and everyone in the world will be implicated and forced to accept the backlash of the natural environment.
Take haze weather as an example, with the development of industry, the occurrence of haze weather in various cities is becoming more and more frequent, and some cities even have to suspend classes and schools because the haze weather is too strong, hindering the normal breathing of the human body.
It is reported that the haze contains a large amount of PM2.5 substances, which have a small radius and are very easy to be inhaled by the human body.
If we open the windows directly for ventilation, these high concentrations of pollutants will take the opportunity to circulate into the human body, and then be inhaled by the human body to threaten life and health.
Therefore, when there are meteorological disasters such as haze and sandstorms, we should avoid opening windows for ventilation.
At the same time, it is extremely unwise to carry out outdoor activities at this time, and we can wait until the weather clears up before doing a series of activities.
Watch out for the night!
When we say not opening windows at night, we don't mean everyone.
For example, friends who live in the countryside, the air quality in the countryside is high, as long as you pay attention to keeping warm, don't catch a cold because of the open window, when to open the window for ventilation is very appropriate.
Friends who live in the city are not so lucky, although they have better living conditions, they cannot avoid the pollution attack brought by the industrial society.
In the city, every day and every night we deal with car exhaust, polluting gases and dust and other undesirable substances, during the day, when we run on the road, the human body will inevitably inhale these undesirable substances, and at night, these harmful substances will be deposited on the ground, still pose a threat to us.
If it's windy and we open the windows on this night, these harmful substances can get caught up in the room.
Of course, even if it's not windy weather, it's still hard to avoid it completely.
Because there are high-speed cars at night, driven by the cars, the dust raised high here is scattered, and it is easy to fall back into our homes.
It is a very common fact that if you look closely at the windows of your home, you can see that a large amount of dust is still clearly visible on the edges of the windows, which is the unknown material that the windows have accidentally isolated from the outside world.
It's hard to imagine how much dust and harmful gases get into our homes and how much we inhale unknowingly in those unknown nights.
In addition, avoiding opening windows at night is not just a matter of dust.
We all know that dark night is the lowest time for a city, especially in winter, some cities have a decent temperature during the day, but the evening is not close to the cold.
After we fall asleep, if we don't keep warm in time, we can easily catch a cold when we are blown by the cold air.
In order to protect the health of our families, we should still check the doors and windows on time every night to prevent any trace of cold air from taking advantage of it.
When is it reasonable to open a window?
There is an old proverb: "If you don't open the window at four o'clock, your family will be less sick." ”
On weekdays, we open the windows for ventilation casually, and there is nothing special about it.
It's hard to imagine that it has such profound knowledge in places we don't know.
We can't help but wonder, where is it reasonable to open windows for ventilation?
Opening the windows early in the morning is superb.
Morning is naturally a staggered rush morning, and we inevitably exhale a lot of carbon dioxide after a full night's sleep.
Therefore, we can choose to open the windows after we wake up, but before the morning rush hour begins.
We also have the option to open the window at noon.
At noon, there is no pressure during the morning and evening rush hours, and there is enough sunlight to kill the virus in the house, so why don't we use such a natural protector quickly?
Finally, we also need to pay attention to the fact that when we are cleaning or cooking, we should also open the windows for ventilation.
Take the big cleaning, for example, although we clean the dirt that is visible to the naked eye, it is also mixed with dust that is difficult to see with the naked eye. If the house is not ventilated in time, the dust can only linger indoors for a long time and can never be eradicated.
epilogue
The so-called "four o'clock do not open the window", in a word, is to be good at observing the weather conditions.
When the air quality is good, we should open the windows for ventilation in time, and when the weather conditions are not good, we should eliminate the opening of windows for ventilation, and choose to use more reasonable air purifiers, dehumidifiers and other equipment to help purify the air.
If we want to maintain good physical condition, it is not enough to care about the indoor air condition, we also need to go out and exercise more often to further protect our body.