Forest fires in Sumatra's Riau province – in pictures

The forest fires continue to cause record-breaking air pollution in Singapore and Malaysia Photograph: Ulet Ifansasti/Greenpeace

An excavator creates a canal in Riau province, despite the heavy smoke caused by the forest fires Photograph: Ulet Ifansasti/Greenpeace

Greenpeace has called on concession holders to urgently extinguish fires on their land, immediately stop the drainage and development on peat and natural forests and ensure palm oil in their supply chains is free from forest destruction Photograph: Ulet Ifansasti/Greenpeace

Villagers wear masks to protect themselves from air pollution as they drive through massive forest destruction caused by forest fires in Sontang Village in Rokan Hulu Regency, Indonesia Photograph: Ulet Ifansasti/Greenpeace

Ernawati, with her son, evacuate their belongings as forest fires get closer to their home in Tanjung Leban Village in Bengkalis Regency, Indonesia Photograph: Ulet Ifansasti/Greenpeace

Firefighters brave the smoke caused by the forest fires Photograph: Ulet Ifansasti/Greenpeace

Firefighters battle to contain the fires Photograph: Ulet Ifansasti/Greenpeace

A firefighter braves the smoke Photograph: Ulet Ifansasti/Greenpeace

The forest fires continue to cause record-breaking air pollution in Singapore and Malaysia Photograph: Ulet Ifansasti/Greenpeace

The Pollutant Standards Index, Singapore's main index for air pollution, has hit record levels Photograph: Ulet Ifansasti/Greenpeace

Market vendors in Dumai wear masks to protect themselves from air pollution caused by the forest fires in Sumatra Photograph: Ulet Ifansasti/Greenpeace

A woman wears a mask to protect herself from air pollution. Pollution levels are classified as "hazardous" and can aggravate respiratory ailments Photograph: Ulet Ifansasti/Greenpeace

Pharmacies in Singapore sold out of masks within a day of the smog descending on the city Photograph: Ferina Natasya/International