How about the annual few weeks or months of haze from tree burning to clear growth in Malaysia and Indonesia? I've heard from friends that it is a health issue

How about the annual few weeks or months of haze from tree burning to clear growth in Malaysia and Indonesia? I've heard from friends that it is a health issue while it lasts, in the two mentioned countries and also in Singapore and maybe in Thailand too; also heard that something was being done to mitigate it, some time back. Do you know if there is any improvement in the situation?