Constant burning down of forests in Indonesia, creates a lot of smoke that reaches Singapore in the form of haze by winds blowing from Indonesia to Singapore. Singapore's PSI hit a high record of more than 400 on June 2013. People also reported that they could smell smoke. Many people had taken some precautions to prevent the haze from affecting their health. Outdoor activities were strongly not recommended. People also wore masks when travelling out.
In my opinion, the haze could be prevented if the people in Indonesia stop burning down forests. Other than the haze burning down of forest can lead to many problems like loss of habitats. I also believe that the haze could cause resporitory problems like asthma.