Hi, I am planning to stay in SIN for three days in two weeks, so I keep monitoring the PSI and PM readings, which are partly climbing towards 230. Just a few questions:
- how do air conditionings of the ** and *** hotels deal with the PM? Are they all equipped with a filter?
- I am a healthy person, so does PSI of 250 etc. really mean no city walk for me? Is the MRT safe?
- Is it necessary to wear a mask and if yes will it be still available in SIN?

Looking forward to your opinions and answers.