Abstract
The concentration of negative air ions (NAIs) is an important indicator of air quality. Here, we analyzed the distribution patterns of negative air ion (NAI) concentrations at different time scales using statistical methods; then described the contribution of meteorological factors of the different season to the concentration of NAIs using correlation analysis and regression analysis; and finally made the outlook for the trends of NAI concentrations in the prospective using the auto regressive integrated moving average (ARIMA) models. The dataset of NAI concentrations and meteorological factors measured at the fixed stations in the Mountain Wuyi National Park were obtained from the Fujian Provincial Meteorological Bureau. The study showed that NAI concentrations were correlated with relative humidity spanning all seasons. Water was an important factor affecting the distribution of NAI concentrations in different time series. Compared with other ARIMA models, the outlook value of the ARIMA (0, 1, 1) model was closer to the original data and the errors were smaller. This article provided a unique perspective on the study of the distribution of negative air oxygen ions over time series.
Highlights
Accepted: 28 April 2021Negative air ions (NAIs) is a generic term for negatively charged gas molecules and ions [1]
2019 were much higher than in other time periods, while negative air ions (NAIs) concentrations were low in October 2018 to January 2019 and August 2019 to February 2020
We found that the lower NAI concentrations occurred in the summer months of August
Summary
Accepted: 28 April 2021Negative air ions (NAIs) is a generic term for negatively charged gas molecules and ions [1]. NAIs referred mainly to oxygen-based negative ions. A study showed that superoxide ions were involved in the biological effects of NAIs [2]. NAIs have many beneficial effects on human health, including physically and psychologically. NAIs have a beneficial effect on the cardiovascular [3,4] and respiratory systems [5]. NAIs can improve sleep quality [6], improve mood states [7] and treat chronic depression [8]. NAIs were mainly generated by the following pathways: cosmic ray [9], radiation emitted by the radon element of mineral [10], solar ultraviolet radiation [11], thunder and lightning [12], the shearing forces of water
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