Good Air Flow May Help Protect from COVID-19

 

From VOA Learning English, this is the Health & Lifestyle report.

On Google, one of the most-searched questions related to the coronavirus is: "Can it spread through the air?"

The answer? Yes. It is possible.

World Health Organization (WHO) officials have said it is possible for COVID-19 to spread in the air under certain conditions. One of these conditions is poor indoor ventilation.

Ventilation is the movement of air through a space -- especially an indoor or enclosed space. We also describe ventilation as "air flow."

Experts say poor ventilation may help the coronavirus stay in the air longer. Fresh air, scientists note, break up virus droplets¹. And this reduces the chances of transmitting, or spreading, COVID-19.

The Environmental Protection Agency (EPA) in the United States says that good "ventilation with outside air can help reduce airborne contaminants, including viruses, indoors."

Such findings are changing safety requirements for workplaces. VOA Learning English recently wrote about this issue.

But what about in our homes? What can we do to improve air flow where we live?

The EPA website lists several ways to increase ventilation in our homes. It also states that, in general, "the greater the number of people in an indoor environment, the greater the need for ventilation with outdoor air."

Open windows and doors

Of course, opening windows and doors is one easy way to let in natural air. However, that may not be enough to increase natural ventilation indoors. If inside and outside temperatures are similar and there is little wind, natural ventilation may be limited.

You can get better air flow by opening windows or doors at different sides of the home. This is called cross-ventilation. Open the highest and lowest windows in a home at the same time. This can be especially helpful if the windows are on different floors in a building.

If your windows open at the top and bottom, open the top of one window and the bottom of another. If you only have one window in a room, open both the top and bottom part way. This will increase air flow.

However, experts warn not to open windows and doors that may cause other health risks. For example, do not open windows if they let in a lot of air pollution. And be sure not to open windows that a child could fall from.

Use fans

Fans are also an easy way to move air around. But simply putting one in the middle of a room might not be enough. Here are more suggestions from the EPA.

Bathroom and kitchens fans are (usually) designed to blow out indoor air. This removes contaminants from the air. So, turn on these fans, if you have them, when the room is in use. Or if possible, keep them running most of the time.

Use portable fans -- ones you can move around -- with open doors or windows. A fan facing a window blows air out of a room. A fan placed away from a window draws air into a room.

Also, you can use many fans – blowing air out of one window and drawing it in from another. If you only have one fan, it should blow air in the same direction that the air is naturally moving. However, to help reduce risks of airborne transmission, do not have the fans blowing directly from one person to another.

When using fans of course be careful of small children. Keep them out of reach of little fingers. Also, make sure the fans will not fall over.

Use air conditioners and other equipment

The EPA website also suggests using window air conditioners that have an outdoor air intake³. But, it is important to know that some window air conditioners do not have outside air intakes⁴.

A home's heating, ventilation, and air conditioning system is called the HVAC system. HVAC filters and air cleaners are designed to remove pollutants⁵ or contaminants from air that passes through them. Experts say that "air cleaning and filtration can help reduce airborne contaminants, including particles containing viruses."

The EPA website says if your home's HVAC system has an outside air intake, open it. Experts advise you to closely look at your HVAC system's information. You may need an HVAC professional's help to make sure your system is running correctly.

Sometimes, ventilating with outdoor air is difficult. For some people, opening windows and doors is not possible because of high temperatures, pollution, or safety risks. In these cases, portable air cleaners may be helpful.

Use other best practices

Portable air cleaners and HVAC filters can reduce indoor air pollution. But they cannot remove all pollutants from the air.

Experts remind us that improving ventilation is just one way to lower the risk of COVID-19. Ventilation should be used along with other best practices suggested by health experts. These practices continue to be social distancing, wearing face masks, cleaning surfaces, and washing hands often.

And that's the Health & Lifestyle report.

I'm Anna Matteo.

Words in This Story

droplet² – n. a very small drop of liquid

contaminant – n. something that makes a place or a substance (such as water, air, or food) no longer suitable for use

fan – n. a machine or device that is used for producing a current of air

draw – v. to let air flow through : to cause to move by pulling

air conditioner – n. to equip with a device for cleaning air and controlling its humidity and temperature

air intake – n. any opening, etc, through which air enters, esp for combustion⁶ or cooling purposes : a device that allows air to flow into a machine

filter – n. a device that is used to remove something unwanted from a liquid or gas that passes through it

best practices – n. a procedure that has been shown by research and experience to produce optimal results and that is established or proposed as a standard suitable for widespread adoption

1 droplets   

n.小滴( droplet的名词复数 )

参考例句：

• Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
• In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反，从人嘴里呼出的烟则包含相当大的水滴，所以呈白色。 来自辞典例句

2 droplet   

n.小滴，飞沫

参考例句：

• The rate of droplet growth under different conditions can be evaluated.可以计算在不同条件下的云滴增长率。
• The test results showed that increasing droplet size was associated with better stability.试验结果表明，增加液滴尺寸将使稳定性提高。

3 intake   

n.吸入，纳入；进气口，入口

参考例句：

• Reduce your salt intake.减少盐的摄入量。
• There was a horrified intake of breath from every child.所有的孩子都害怕地倒抽了一口凉气。

4 intakes   

吸入( intake的名词复数 )； （液体等）进入口； （一定时期内）进入或纳入的人数； （采煤）进风巷道

参考例句：

• The Tornado jet fighter-bomber has two air intakes. 旋风式喷气轰炸机有两个空气入口。
• The air intakes to the carburetors were filling up with freezing snow. 汽化器的进气道被积雪封住了。 来自英汉非文学 - 百科语料821

5 pollutants   

污染物质（尤指工业废物）( pollutant的名词复数 )

参考例句：

• Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
• The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条（g）的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法

6 combustion   

n.燃烧；氧化；骚动

参考例句：

• We might be tempted to think of combustion.我们也许会联想到氧化。
• The smoke formed by their combustion is negligible.由它燃烧所生成的烟是可忽略的。