I got curious and googled the "most polluted cities" I got this.
Manila is not mentioned, I could just imagine the places mentioned below.
got this list as of oct 2006 from this website http://www.livescience.com/environment/061018_polluted_places.html
Linfen, China, where residents say they literally choke on coal dust in the evenings, exemplifies many Chinese cities;
Haina, Dominican Republic, has severe lead contamination because of lead battery recycling, a problem common throughout poorer countries [image];
Ranipet, India, where leather tanning wastes contaminate groundwater with hexavalent chromium, made famous by Erin Brockovich, resulting in water that apparently stings like an insect bite [image];
Mailuu-Suu, Kyrgyzstan, home to nearly 2 million cubic meters of radioactive mining waste that threatens the entire Ferghana valley, one of the most fertile and densely populated areas in Central Asia that also experiences high rates of seismic activity;
La Oroya, Peru, where the metal processing plant, owned by the Missouri-based Doe Run Corporation, leads to toxic emissions of lead;
Dzerzinsk, Russia, one of the country's principal chemical weapons manufacturing sites until the end of the Cold War [image];
Norilsk, Russia, which houses the world's largest heavy metals smelting complex;
Rudnaya Pristan, Russia, where lead contamination resulted in child blood lead levels eight to 20 times maximum allowable U.S. levels;
Chernobyl, Ukraine, infamous site of a nuclear meltdown 20 years ago; and
Kabwe, Zambia, where child blood levels of lead are five to 10 times the allowable EPA maximum [image].