 On 7 October 2006, the 3-hour PSI reading breached the 100 mark at 8 a.m. and entered unhealthy levels for the first time in the year, as winds from neighbouring Sumatra blew the haze to Singapore.At 10 a.m., it hit 130, the highest in three years, before subsiding to 80 at 4 p.m. and climbing rapidly to 150 at 9 p.m., the worst since 1997, before ending the day at 136, still in the unhealthy range.Although the air quality was set to improve with the arrival of the Northeast monsoon rains in mid-October, southeasterly winds extended the hazy season.