![A camel-mounted tourism policeman in the Giza Plateau silhouettes against the pollution smog covering the city of Cairo 23 October 2007. For the eighth consecutive year, pollution is causing serious respiratory infections in the city with a population of over 17 million, with levels of NO2 measuring 305-482 mg in Giza and Cairo, double the threshold set by the World Health Organisation (WHO). The pollution is attributed to the seasonal burning of rice straws to mark the end of the holy month of Ramadan, the daily open-air incineration of 12,000 tons of domestic refuse, in addition to the emission of polluting substances from industries and more than 1.6 million vehicles in Cairo and adjacent neighbourhoods. AFP PHOTO/CRIS BOURONCLE (Photo by CRIS BOURONCLE / AFP)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/7HC5PGZ6EJKUN3BIZCJOWQHQQU.jpg?smart=true&auth=5dfa013dc0fcf0f5dd6ac5cfc45e035278dea2f008623ca954ee8031ac4e0d7e&width=400&height=225)
Pollution smog covering Cairo, which is among the worst cities in the world for nitrogen oxide presence in the air. AFP
Pollution smog covering Cairo, which is among the worst cities in the world for nitrogen oxide presence in the air. AFP
World Environment Day: Middle Eastern cities choked by air pollution
Development in the region has caused a rise in power stations and cars – and a drop in air quality