On the horizontal axis of each graph, wehave total traffic-related airpollution exposure, increasing in parts per billion (a part here would be a drop in a billion drops) from left to right.
Wehave the technology to clean up the unhealthiest sources of airpollution, and my research reiterated for me that we can't afford to wait too long to clear the air.
Yet, despite all the evidence implicating both indoor and outdoor air pollution's harmful impact on public health, we still have so much to do to clean up our act.