SINGAPORE - With greyish, hazed-shrouded conditions now a familiar sight thanks to an extended dry spell and the ongoing forest fires in Indonesia, have Singaporeans forgotten what clear blue skies look like?

This year's crisis in the region is set to be one of the worst on record, according to the US National Aeronautics and Space Administration, with the haze said to possibly last till November.

In case your memory is a little hazy, check out our haze sliders for a look at various locations across Singapore - before and after the haze.

1. Singapore Sports Hub

View of the Sports Hub in May 2014 (left) and on Oct 5, 2015, at 9.30am, when the 3-hour Pollutant Standards Index (PSI) was at 142. PHOTOS BY LIM YAOHUI FOR THE STRAITS TIMES

2. Tanjong Rhu

View of Tanjong Rhu condominiums in April 2014 (left) and on Oct 5, 2015, at 9.26am, when the 3-hour PSI was at 142. PHOTOS BY LIM YAOHUI FOR THE STRAITS TIMES

3. Rochor Centre

View of the area around Rochor Centre on May 13, 2013 (left), and on Oct 5, 2015, at 9.30am, when the 3-hour PSI was at 142. PHOTOS BY LIM YAOHUI FOR THE STRAITS TIMES

4. Central Business District

View of the CBD skyline in July 2015 (left) and on Oct 1, 2015, at about 1.30pm, when the three-hour PSI was 182. PHOTOS BY LIM YAOHUI FOR THE STRAITS TIMES

5. Woodlands Checkpoint

View of the Woodlands Checkpoint on Sept 30, 2015, at 7am (left) when the three-hour PSI was 125, and at 3.30pm when the reading was 203. ST PHOTOS BY WONG KWAI CHOW

6. Mountbatten Community Club

View of the Jalan Satu area on Sept 25, 2015 (left), and on Sept 24, 2015, at 5.30pm, when the 24-hour PSI breached the very unhealthy mark at 204-248. ST PHOTOS BY DESMOND WEE