Changes in Air Pollutants and Their Relationship with Meteorological Factors

Using the spearman rank correlation coefficient analysis of the past 10years,Beijing'air pollutants,discussing the relationship of air pollutant'concentrations and meteorological factors by broad gray correlation theory.The results showed that four major air pollutants were significantly decreased nearly 10years.NO2,particulate matter and CO in a phased stable trend,while SO2has been declining.The most important meteorological factors which impacted on SO2,NO2and average concentrations of respirable particulate matter are average relative humidity.The main meteorological factor of CO is the annual of sunshine.The average relative humidity is optimal factor affecting air quality,the respirable particulate matter is the optimal characteristics of air quality.