Nowadays, we use Wi-Fi every day. It is such a powerful technology like it can go everywhere, to your house, into the mall and even on the street; but have you ever thought that Wi-Fi may also "penetrate" into your body, making your heart pounding fast, causing your heart palpitates and even attacking your body? 

Here you could know if Wi-Fi is harmful to your health.

Q: What is Wi-Fi?

A: Wi-Fi is a technology that allows electronic devices to exchange data wirelessly by the radio waves like TV and radios. It ranges from 2.4 to 5 GHz.

Q: Does it carry radiation?

A: Yes, but the level is very low. A research from the British Health Protection Agency said that exposing to Wi-Fi for a year is just as talking to the cell phone for 20 minutes.

Q: Does Wi-Fi radiation penetrate our body like X-ray?

A: No, they generate different types of signal. Wi-Fi is of the non-ionising type, unlike the ionising X-ray which would bring significant harm to our body.

Q: Will my body be affected while exposing to Wi-Fi?

A: Probably no. According to the scientific research from different expert panels, government and health authorities, there is no established evidence to illustrate that Wi-Fi would harm one's health.

Q: How if I am a child, elderly, pregnant or ill?

A: No worry, Wi-Fi still cannot hurt you. As all Wi-Fi devices are bounded by the international exposure standards endorsed by the World Health Organization, which takes all population, including children, elderly, ill and pregnant into account.

Q: How about the CUHK Wi-Fi? Is it safe to stay at CUHK with Access Points (APs) all around?

A: Certainly in CUHK, you are safe to walk around. University centrally installed Wi-Fi devices, Aruba AP, are certified by the Wi-Fi Alliance, an internationally recognized trade association which continually monitors information regarding health and Wi-Fi products.  Therefore, you are safe to use them.

If you want to know more about Wi-Fi and health, you are welcome to visit

1.   The webpage of the World Health Organization

       http://www.who.int/mediacentre/factsheets/fs304/en/index.html

2.     Data sheet of CUHK Wi-Fi device

       http://www.arubanetworks.com/pdf/products/DS_AP130Series.pdf

3.     Wi-Fi Health brochure from the Wi-Fi Alliance

 http://457-northumberland.eschools.co.uk/site/1622-about/section-15971-wifi-safety

4.     Government: Wi-Fi and health

 http://www.gov.hk/en/theme/wifi/health/

5.     OFTA: Public Wi-Fi Installations in Hong Kong

 http://tel_archives.ofca.gov.hk/en/report-paper-guide/report/rp20071012.pdf