Air quality has entered an unhealthy range, with the 24-hour PSI reaching 104 in a certain region. This reading was recorded at 9am on Sept 4. The PSI had crossed 101, indicating a decline in air quality.

Further information is available from the source. The reading of 104 was specifically recorded in the central part of a particular area.

Details of the current situation and any updates can be found in the source publication, which reported the PSI reading at 9am on Sept 4.