According to foreign media new atlas, technological advances have enabled some high-tech methods to monitor air quality, from satellites orbiting the earth to art devices that light up when pollutants are low. Scientists at the University of Utah have come up with a relatively low-tech solution that shows how to use the accumulation of magnetic particles on leaves to measure the quality of the surrounding air. < / P > < p > this study is actually carried out by geologists, who usually investigate the composition of previous continents by studying the magnetism of rocks. As part of the study, the team looked at previous studies that showed how leaves capture magnetic particles released from car exhaust and fossil fuel emissions, so they can be used to track air pollutants in the urban environment. < / P > < p > these particles are usually too small for the human eye to see, but some contain high concentrations of iron that can be detected with magnetometers used by geologists in their typical work. As a result, researchers began to investigate the potential of leaves as a local air quality monitoring station. < / P > < p > this includes collecting pine needles from four evergreen trees on the campus, three of which are close to a highly used road and the fourth is located away from traffic. The scientists collected samples at two sites, one after a relatively good summer in 2017 and the other in winter, when air quality was at its worst. < / P > < p > using magnetometers and electron microscopes, the team found that pine needles collected in winter had about three times the magnetic susceptibility as those collected in summer. These winter pine needles were found to be significantly dirtier, and scientists found evidence of other elements in the particles, such as titanium, vanadium and zirconium, as well as other elements related to brake dust, fossil fuel combustion and exhaust gases. < / P > < p > the team found lower concentrations of magnetic particles in samples taken far away from the road, which they said could be due to the distance from the vehicle, but it could also be due to altitude, where the tree lines were skewed. < / P > < p > to further advance this concept, the researchers developed an artificial pine branch that uses 3D printing needles to collect particulate matter. Scientists will better understand how these particles accumulate on the platform of magnetic particles such as rain. < / P > < p > “if we encounter a heavy rainfall, we can collect it before and after the rain to see if the signal is just washed away every time it rains,” said grant real Downing, the study’s author. “Or do biological needles actually absorb material and actually hold this signal longer than synthetic needles?” < / P > < p > the team believes that this approach has great potential to provide accurate data on air quality in urban areas, possibly revealing changes in areas just tens of feet apart. To its advantage, the infrastructure is in place, providing a cheap and simple way to implement the method on a large scale. < / P > < p > “as long as there is a tree, there is a data point,” says rea downing. “A tree doesn’t cost $250 to deploy. We will be able to map the distribution of particulate matter at very low cost and with very high resolution. ” After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today