Translating an academic article on the health effects of highway air pollutants on the people who live near them

What I have learned after reading the article:

Near-highway pollutants in motor vehicle exhaust: A review of epidemiologic evidence of cardiac and pulmonary health risks

is that the jargon and terminology used in this review is great for making its insights inaccessible and bewildering to anyone that may be concerned about how these study results may affect them, or to anyone else for that matter.

Sentences like these are ridiculous:

"Several lines of evidence now suggest that steep gradients of certain pollutants exist next to heavily traveled highways and that living within these elevated pollution zones can have detrimental effects on human health."

• All this means is: There are a lot of pollutants found in higher densities near highways that will probably cause you health issues if you spend too long around them. 

"In contrast, studies that relied on central monitors [27,28] or interpolations from central monitors to highways are prone to exposure misclassification because individuals living close to highways will have a higher exposure than the general area. A possible concern with this interpretation is that social gradients may also situate poorer neighborhoods with potentially more susceptible populations closer to highways."
.....

• Which basically says: Air quality monitors that are placed in central areas in cities don't accurately show just how bad air is closer to highways. -- and then I'm completely lost with the second sentence. 

Anyway, the idea to come away with after reading this article is that while there still needs to be some more conclusive research done about the subject, it is a pretty good bet that living within 300 meters of a highway is going to be unhealthy. And also that there is not a whole lot being done to change regulations regarding this problem and the health of the populations who do live near highways (this article came out in 2007 so that may no longer be the case).