Gardening in a polluted paradise: Is it safe?

Gardening in the city is today's popular solution to urban greening and biodiversity. But, taking into account the pollution levels we experience living in big cities, is it really safe to grow vegetables in the city?

http://www.sciencedaily.com/releases/2015/05/150515111628.htm

In the article above, it is explained hoe vegetables take up different soil contaminants.

The researchers from Kansas State University grew tomatoes, collard greens and carrots in different type of soils. They also looked soil compounds called polycyclic aromatic hydrocarbons, which are potentially cancer causing and are believed to be found in urban environment soils.
The research then showed that the amount of compounds in the vegetables was safe. it was only the root vegetable causing concern, because they generally take up higher levels of lead from the soil.

However, the researches stated even with the small amount of this dangerous cancer-causing compound, the vegetables are still absolutely safe to eat. Even though, I found it a little bit disturbing, I would not  be happy to know that the food I'm eating contains potentially dangerous compounds. Surely, I will not be able to consume the amount of vegetables that it takes to actually make the compound dangerous, but the fact that it is there is just a little bit concerning.

Reflecting on those worries, the researches also tested different ways to decrease the chance of consuming the soil particles. the tests showed that while washing the vegetables in the lab with the soap was most successful, simple thorough wash with water would still be enough.

So, even though there are some dangerous compounds in the urban garden soils, it is important to know what are the other benefits and to evaluate risks. The small amount of soil compounds will not harm you, and overall urban gardens  do provide access to fresh fruits and vegetables right while living in the urban jungle.