As Thais woke up on Monday morning to another day of murky air blanketing its bustling construction-filled capital, environment group Greenpeace said Bangkok was now the 10th most polluted in the world, rivalling some cities in China.
Speaking as the government's Clean Air Strategy was launched, and asked what he would say to Ella's family, Mr Hancock told the Press Association: "That I hope as a society we can use this bad tragedy to persuade more to support the cause of clean air".
Air pollution in the greater Bangkok area was again threatening residents' health on Sunday morning. It said that Bangkok's particulate matter (PM) figure is high but it is not a crisis yet. "We are not in the range of 120-150 where all people have to wear masks all the time when they are out".
Almost a week since the PM2.5 level in Bangkok rose significantly, forming a thick layer of smog over the city, the air in Bangkok yesterday remained severely polluted.
We have made strides forward over the past few years and the action we are taking today will save lives and improve the health of the nation - both for those of us here today and for generations to come.
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"It is devastating for the family and we should all use this example as a reminder of why to support clean air - because clean air saves lives".
The data of combined Andhra Pradesh showed that the deaths due to pollution occurred most in the age group of 50 to 55 years. In short: clean air helps you live longer.
His research on pollution-related health costs in 2017 found that every microgram of PM10 beyond the safe limit will cost Bangkok's inhabitants up to THB18.42 billion (US$577 million) in medical expenses. And many children and seniors can be seen going about their outdoor activities as usual.
Environmental health expert Sonthi Kotchawat has warned that PM2.5 is harmful because its very fine dust particles are small enough to pass through a person's lungs and enter the bloodstream.
Witsanu is among the academics who called on the government to take the air pollution problem more seriously and to undertake mitigation efforts in the interests of public health and the economy. Bangkok (left) has been hit by persistent smog caused by a mix of exhaust from vehicles, the burning of fields by farmers outside the city and pollutants from factories.