Surely you could then judge more exactly who is affected how much. On the other hand, we already have more than 1000 measuring points in Germany. At some point, it must be enough. But you could December 2018 Calendar US measure much more accurate? Yes, sure. If we drive through the cities with the measuring vehicle of Forschungszentrum Jülich, the result is a huge range of measured values.
December 2018 Calendar US
Sometimes a huge amount of nitric oxide is found in a street, and 100 meters further on the situation is quite different. That can differ by a factor of ten or more. That depends on whether there is a street canyon. And how strong and how fast the wind swirls and dilutes the air masses through the street canyon. Of course, the weather also plays a role. Whether there are traffic lights or traffic obstructions. All these factors influence the nitric oxide concentration. But the main point is the traffic density.
High-tech exhaust gas measurement © RAINER KURLEMANN (AUSSCHNITT) High-Tech Exhaust Gas Measurement | This vehicle of the FZ Jülich is a moving laboratory. Crammed with measurement technology, it can measure the pollution of the air with pollutants in real time while driving. The result: Although a road is heavily loaded, even in the side street, the situation can be quite different.
Are there any scientific projects that explore this more closely? The interesting thing is that the values and relationships have long been known to experts. The Federal Environment Agency (UBA) regularly awards contracts to research institutions. For example, to Graz, so our data come from. There is measured at individual cars at the exhaust, which comes out.
The institute in Graz has been aware for ten years that the limit values for diesel cars are not met. You can read about it in scientific publications and press releases, but nobody reacted at that time. They repeatedly point out that nitrogen oxides consist of NO and NO2. Why is this clue important? From a scientific point of view, one has to keep in mind that vehicles emit mostly nitric oxide NO. About 85 percent of the nitrogen oxides are emitted as NO, only 15 percent as NO2.
But only NO2 is legally restricted because it is much more harmful than NO. NO2 is measured at the traffic-related measuring points in the inner cities. There you have the direct emission of NO2 from the traffic, which is usually low. The large remainder of the observed NO2 results from the conversion of NO into NO2 by ozone. The ozone concentration in the air thus influences the amount of NO2. These relationships have been known for decades. You can see that very well in the summer.
When it’s hot, there’s more ozone, of course. Then in the cities immediately higher NO2 levels are measured, even if the traffic has not changed. This is because more NO is being converted. Spectrum Compact: City December 2018 Calendar US of the Future – Modern Life in Urban CentersCould You Also Be Interested? Spectrum Compact: City of the Future – Modern Life in Urban Centers Doesn’t matter where the NO2 comes from in the air ?No. For example, ozone is transported to the city by wind from the environment.