Smoke-developed index (SDI) from cigarette in Thailand’s airports is four times higher than in the United States, according to a research conducted by Mahidol University.

If no measures are taken, people with heart disease or asthma could experience heart failure, said the survey.

The research was conducted in four main airports, including Suvarnabhumi, Don Mueang, Phuket, and Chiang Mai. It showed that passengers are being exposed to a high intensity of cigarette smoke, 773 micrograms per cubic meter, which is much higher than the limit Thailand has defined at 50 micrograms per 1 cubic meter.

The World Health Organisation (WHO) also limits the SDI at only 25 micrograms a cubic meter. The survey also suggested that 58 percent of the smokers at these airports are foreigners.-VNA