What is the effect of tobacco on city health?

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Smoking a cigarette is equivalent to an air pollution level of 22 µg/m3. The most extreme case was recorded in 2015, in the Chinese city of Shenyang, which reached levels of 1,400 μg/m3, equivalent to smoking 63 cigarettes a day!

Madinah, where technology meets tranquility

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Some 350,000 people meet every day in the Mosque of the Prophet, in the Saudi city of Madinah. Pilgrims arrive almost at the same time to attend the prayer. They also leave the place within a few minutes of each other. Managing the huge tide of pilgrims and the inevitable traffic jams is one of the biggest challenges for the Madinah Region Development Authority (MRDA), the government institution responsible for much of the management of the municipality.