son's chronic condition forced into and mirka fan version to move out to the suburbs but you'll scoff hasn't improved it seems there's no escaping colognes polluted air. we've even considered moving to the coast at all you know but i'm a teacher so i can't just get up and leave it's always a question of where you can find a job but theoretically everybody should move away from cologne. traffic is one of the causes of air pollution in cities 63 percent of traffic related particular matter is generated by breaking. anti aware only 37 percent stems from engine source engines are primarily responsible for the not triggered signs in city air less so for particulate matter. traffic generates high levels of dangerous ultra fine particles toxins adhere to their surfaces and can enter the bloodstream. in downtown cologne pediatrician christian during is vacuuming dirt off the street deposits of fine particular matter consisting of sort and rubber as well as lead barium aluminum and mercury street cleaning has long been used as a method of reducing traffic related air pollution but what christi

. >> right >> you and your wife mirka, and actually when you were out with your knee injury, it wasn'tory was crazy i just lost my semifinal match at the australian open and i woke up in the morning and i was tired, the pressure fell off, the match was over, and my kids went to the pool in the morning, and i woke up around probably ten in the morning, and they came back, and i was like, okay, let's jump in the shower, and the girls were like, no, we want to take a bath, dad, and i'm like, no, shower it is, no, bath it is, okay, fine, it's bath i'm tired so i go, and i open the water and as i'm turning, i hear the knee go click and i go back, and that was strange i go to the zoo, and i'm limping like you can't believe, and i'm like i don't know what's happened and i go to the doctor, torn meniscus. >> of all things. >> that's how it goes, doesn't it >> you guys travel all around, that's the other thing that's really cool. i can't even imagine your logistics, but you and the family go everywhere together. >> they didn't come on the south america tour, but they come with me 80% of the tim