Geography

What caused the air quality to fall in Singapore?

When did this happen?

Where is the air pollutants from?

How does it affect Singapore?

https://theindependent.sg/nea-burnt-smell-drifts-across-singapores-east-as-johor-forest-fire-affects-air-quality/

https://www.straitstimes.com/singapore/haze-in-eastern-singapore-likely-due-to-hot-spot-in-johor-nea