Dhaka worst-affected in world by urban heat

Dhaka is the most affected city in the world due to the dangerous urban heat, as per an analysis published in The Guardian yesterday.

In the years 1983-2016 between 1983 and 2016, when the city's population increased significantly, Bangladesh's capital witnessed an growth of 575 million person-days (the amount of people who are that is exposed to the cumulative heat of an aforementioned year for an area) in extreme heat the study found.

Other cities that experienced rapid growth in population include Shanghai as well as Guangzhou within China, Yangon in Myanmar, Bangkok in Thailand and Dubai in the United Arab Emirates, the Guardian reported the study as declaring.

Based on the research, exposure to the deadly urban heat has doubled since the 1980s and now affects almost one-quarter of the world's population.

Scientists have put the alarming trend on the back of the combination of rising temperatures and increasing populations of urban areas. They warned of the potential for its fatal impacts.

In the past few years the number of people have migrated from the countryside to cities, and they are today home to more than half of the world's inhabitants. In the midst of asphalt and concrete that hold and concentrate heatand a lack of vegetation, temperatures are typically greater in urban areas.

"This has broad effects," said Cascade Tuholske, the lead author of the study , which was published in PNAS as a postdoctoral research fellow in Columbia's Earth Institute.

"It increases morbidity and mortality. It impacts people's ability to work, and results in lower economic output. It exacerbates pre-existing health conditions."

The study employed infrared satellite images and the maximum daily humidity and heat data from more than 13,000 cities between 1983 until 2016 to calculate the amount of people exposed to days during a year that were above thirty degrees Celsius (86F) according to the scale of temperature on the globe that is wet (which is based on the multiplication effects of humidity) in a particular area. The results were compared to the city's population in the same time frame.

The study revealed that the number per-day rose from 40 billion in a calendar year back in the year 1983, to more than 119 billion by the year 2016, which is the triple increase. In 2016 1.7 billion of people exposed to extreme heat over a number of days.

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