With the haze thingy, blowing from Indonesia to the East into Malaysia, Singapore and the neighbouring country, it is advisable to stay indoor, drink as many fluid as you can, wear a health mask if you want to go out and check on the PSI (Pollutant Standard Index) level. The PSI (or API, Air Pollutant Index) level is the indication of whether the outside air is healthy, unhealthy or hazourdous. It’s good to keep track of it and see how bad it is.
Well, you can check out this website here AQICN.org where you can check the latest up date of the PSI level in your area, it’s location based and you can search for other location too. I find it quite convenient to surf around, so check it out and take care.