Singapore experienced a shift in air quality on Saturday, beginning with unhealthy readings in three areas. Conditions deteriorated initially, prompting concern among residents. However, the air quality steadily improved throughout the day, moving into the moderate range. The initial unhealthy levels were likely due to increased haze in the region. Authorities have not yet released details regarding the source of the haze, but monitoring continues. The improvement offers relief to those sensitive to poor air quality, though vigilance remains advised. Residents are encouraged to stay updated on the latest air quality reports.