cross-border environmental issues has been hard to come by, but a 40-year-old air pollution treaty has enjoyed great if largely unsung success, leading to cleaner air, healthier forests and the prevention of hundreds of thousands of premature deaths. However, most evidence suggests that this is more likely in situations when concentrations are elevated over long periods of time and not just over a few days. There is so far no evidence that short-term increases in air pollution have permanent effects on the developing lung. Black carbon is one of the components of particulate matter and comes from burning fuel . Most air pollution regulations focus on PM2.5, but exposure to black carbon is a serious health threat as well. Populations with higher exposures to black carbon over a long period are at a higher risk for heart attacks and stroke. In addition, black carbon is associated with hypertension, asthma, chronic obstructive pulmonary disease, bronchitis, and a variety of types of cancer. Domestic sources of air pollution can also be important. These include wood heaters, backyard
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