A recent study by scientists found that fine particulate matter (PM2.5) in the air could seriously interfere with satellite observations, making the measured nitrogen dioxide contamination data 30% to 50% lower than the actual concentration.
Nitrogen dioxide is a pollutant in exhaust gas from factories and automobiles and is considered to be one of the sources of PM2.5. In a number of cities in China, Japan and Korea with high concentrations of nitrogen dioxide, and in places with good air quality such as Nagasaki and Okinawa in Japan, the research team of the Japan Marine Research and Development Agency set up testing instruments and carried out about 6 in 7 locations. Continuous testing of the year and comparison with satellite observation data from countries such as the United States.
It was found that the more particulate matter such as PM2.5 in the atmosphere, the higher the concentration of nitrogen dioxide near the surface, and the lower the satellite observation of nitrogen dioxide is than the ground observation. The research team believes that the satellite uses the spectrum to observe the concentration of nitrogen dioxide from the space to the surface. The higher the PM2.5 concentration, the less the solar light can reach the surface, resulting in satellite observation misalignment, which is likely to be underestimated by 30% from the actual level. 50%. Research leader Jin Gu Yougang said that satellite observations of other pollutants may also be affected similarly, and air pollution may be more serious than people thought.
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