This is the status that at around 8.53pm which i have gotten from this website http://aqicn.org/map/singapore/. If you are feeling itchy around your eyes area, perhaps you might want to go to the link to check on the PSI level.
For sore , itchy throat, perhaps you may want to try this herbal drink.
prunella (selfheal spike), 夏枯草 (Pinyin: xià kū căo)
you can just boil it with water and drink it to clear your throat.