We already knew that air pollution killed more people than AIDS and malaria combined, but sadly the problem isn’t always getting the attention it deserves. So it’s good to see that someone finally pinpointed the seriousness of the problem: World Health Organization (WHO), who last year recognized that diesel exhaust can causes lung cancer. This means that air pollution is now categorized along with tobacco smoke, UV radiation and plutonium. This research on cancer is different from previous research that showed air pollution to cause heart disease and lung problems. “The air we breathe has become polluted with a mixture of cancer-causing substances,” says Dr Kurt Straif, Head of the IARC (International…