This week, we've examined new studies linking brain damage to breathing. Let's take on heart disease now. Short-term exposure - less than seven days - to common air pollutants raises the risks of heart attack, according to a new study that looked at air quality from 100 studies on five continents. "...an improvement in air quality could have a significant effect on public health,” wrote the authors, led by Dr. Hazrije Mustafic of the Paris Cardiovascular Research Center at University Paris Descartes. Dr. Jesus Araujo, an assistant professor of medicine and director of environmental cardiology at UCLA, said there is now “more than enough evidence” from human, animal and cellular studies that air pollution kills. One of the most important findings of the new research is that it confirms that heart attacks increase even when exposures to worsening air quality are short in duration.“We don’t have to be exposed for weeks or months or years,” Araujo said. The study found harmful effects to the heart from breathing in microscopic particulate matter, or soot, sulfur dioxide, nitrogen dioxide and carbon monoxide, often at levels that are considered "safe." “The more scientists look, the more they find effects at lower exposures,” said Jean Ospital, Director of Southern California's Air quality District, “This is a question that always comes up, how low do we need to go to protect public health? It seems to be a moving target in terms of where the health effects are, where we really need to go to have health protection.” Indeed.