Pollution in Cairo

Middle East Online reports that Cairo is still polluted:

"For the seventh year running, a mysterious black cloud has appeared over Cairo, triggering serious health concerns for the polluted city's 16 million residents.

"Emissions of nitrogen dioxide, which cause serious health risks above certain levels, have reached record heights in the city, from the banks of the Nile, past the industrial suburbs of the delta and even in the desert areas...

"Experts agree that in addition to an explosive urban population, Cairo suffers from an unfavourable natural environment which reinforces the harm caused by the polluting factors.

"Very high temperatures, no rain, little wind and sand blowing in from the desert all contribute to turning the overcrowded megalopolis into an urban inferno, something the authorities are increasingly desperate to fight."