Skip to main content

How do we interpret PM2.5 value?

The haze condition in Singapore worsens especially on yesterday when the Pollutant Standards Index (PSI) breached hazardous level. PSI is used and well known in Singapore as an air quality descriptor. Another important descriptor not to be over-sighted is the PM2.5 level which is a dominant pollutant during haze episodes. The smaller PM2.5 particles can pass through the smaller airways and travel deep into the lungs.

How do we interpret PM2.5 and at which level should we be cautious?

PM2.5 (µg/m3)PSI (Singapore)Health Concerns
0 - 120 - 50Good
12.1 - 35.451 - 80Moderate
35.5 - 55.481 - 100Unhealthy for sensitive groups
55.5 - 150.4101 - 200Unhealthy
150.5 - 250.4201 - 300Very unhealthy
250.5 - 350.4301 - 400Hazardous
350.5 - 500.4401 - 500Very hazardous

Popular Posts

Ho Ching named 5th most powerful and is mistaken as first lady by Forbes

Forbes named Singapore Prime Minister wife and CEO of Temasek Holdings, Ho Ching, as the 5th most powerful woman in the world. Ho Ching is mistaken as Singapore's first lady! OMG!

I wonder how can Forbes makes such a blunder. For a complete list, refer to here.

How to stop FortiClient from starting automatically?

Installed FortiClient recently but the challenge in disabling the application/service from running automatically on every start-up annoyed me. Attempt to stop 'FortiClient Service Scheduler' only return 'Parameter is incorrect' error message.

An article on Technet help solve my trouble. To stop FortiClient from starting automatically, try the following:
Shut down FortiClient from the system tray.
Run net stop fortishield on command prompt.
Run msconfig.
On msconfig, switch to the Services tab. Clear the FortiClient Service Scheduler check box and click Apply.Run services.msc on command prompt to open up show all available services.Look for FortiClient Service Scheduler. Switch Startup type to Manual.Restart your computer. FortiClient should not be running automatically the next time round. Hope it helps.

Check if Your Username is Registered

usernamecheck.com offers an online service to check if your preferred username has been taken. I have checked mine "hongjun" and found the findings as below:

Where is Your Username registered
http://usernamecheck.com/