Singapore's 24-hour Pollutant Standards Index readings eased overnight after hitting their highest levels of this year's haze season on Friday. The numbers have come down, but they remain in the unhealthy range, which means advisories against prolonged outdoor activity still apply. The haze drifting over the island comes from fires burning in Indonesia, a pattern that repeats during most dry seasons in the region. Outdoor workers and people with respiratory conditions feel the impact first when the index climbs. Friday's highs made this stretch the worst air quality recorded so far this season. Forecasts for the coming days will decide whether the improvement holds or whether the wind shifts the smoke back over the city. Health advisories stay in place while the readings sit above the moderate band.