The air quality in downtown Cairo is more than 10 to 100 times of acceptable world standards.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/thick-haze-cairo
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network-us
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/egypt
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control