The foul odour along Karachi's coastline has been linked to decaying phytoplankton, with changes in sea temperatures causing large numbers of marine plants to die and wash ashore. In a statement, World Wide Fund for Nature-Pakistan (WWF-P) technical adviser Moazzam Khan said the odour along the coastal belt is due to the rotting of marine plants.

According to Khan, changes in sea temperature cause large numbers of phytoplankton to die and wash up along the coastline. The end of the monsoon and the decline in wind speeds generally affect the marine vegetation system, he said.

Meanwhile, the Pakistan Meteorological Department (PMD) forecast the port city's weather to remain hot and humid today. According to the Met Office, low pressure over the Arabian Sea has weakened further, with sea breezes expected to resume in Karachi from this evening.

The department added that winter could be prolonged in the northern and upper parts of the country, while winter rainfall may remain above normal nationwide.