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Bsolute value of your Pearson correlation coefficient is straight proportional to the correlation. In line with its size, it might be divided into the following categories: 0.eight.0 (very sturdy correlation), 0.six.8 (strong correlation), 0.4.6 (medium degree correlation), 0.2.4 (weak correlation), and 0.0.two (extremely weak correlation or no correlation) [21]. To analyze the long-distance transportation of EBCs, the prospective supply contribution function (PSCF) model [22] is applied within this study. The model treats the pollution contribution of each area for the receptor point as a ratio with the pollution trajectory for the residence time of all trajectories in the passing area and is extensively made use of in analyzing the source of atmospheric pollutants. three. Results three.1. EBC Variation Trends The 880 nm band is normally utilized to measure normal EBC concentrations, which could possibly be defined as the output EBC Hematoporphyrin Biological Activity Concentrations as brown carbon absorption contributes small. Concentrations measured at shorter wavelengths are usually larger than 880 nm band concentrations because of brown carbon absorption. The introduction of measurements at shorter wavelengths may perhaps represent the light absorbing effects of brown carbon [23]. In this study, the daily average in the derived EBC concentrations at seven wavelengths is shown in Figure two. Contemplating representativeness, this study chosen daily measurements with no less than 16 h of information. In total, 651 efficient every day measurements of EBC concentrations have been obtained. Taking 880 nm as the normal EBC measurement, from May well 2014 to July 2016, the each day maximum EBC was 11.50 103 ng/m3 , the minimum was 0.02 103 ng/m3 , and also the typical concentration was 2.44 103 ng/m3 . Among these seven bands, the peak worth of 370 nm was noticeably larger than that of your other bands. The variation trends of all seven wavelengths are comparable, with relatively low and stable values in the summer and autumn and speedy increases in the winter and spring. The measured month-to-month average EBC are shown in Figure three. Taking into consideration the representativeness and statistical significance, only the months with at least 15 powerful days are selected to calculate the month-to-month typical concentration. Therefore, there is a lack of typical data for five months: December 2014, January 2015, November 2015, December 2015 and May perhaps 2016. The EBC concentrations within the winter were larger than these within the other 3 seasons, while the concentrations in the autumn were greater than these inside the spring and summer season. Inside a year, from 20 November to 10 March is deemed the heating season, as well as the rest are considered the nonheating season.Atmosphere 2021, 12,6 ofFigure 2. Day-to-day variations in EBC in Xuzhou from May well 2014 to July 2016. To make sure the representativeness with the daily average, only every day measurements with extra than 16 hourly signifies are chosen.The measured monthly typical EBC are shown in Figure three. Thinking of the representativeness and statistical significance, only the months with no less than 15 powerful days are chosen to calculate the monthly average concentration. Hence, there is a lack of average information for 5 months: December 2014, January 2015, November 2015, December 2015 and May well 2016. The EBC concentrations in the winter had been higher than these inside the other 3 seasons, while the concentrations inside the autumn were larger than those in the spring Figure 2.and summer. Inside ain Xuzhou from May perhaps 2014 to to 10 March ensure the representativeness from the day-to-day Day-to-day variations in EB.