Air pollutant concentrations

About: Air pollutant concentrations is a research topic. Over the lifetime, 1652 publications have been published within this topic receiving 36138 citations.

Contrasting Trends of Surface PM2.5, O3, and NO2 and Their Relationships with Meteorological Parameters in Typical Coastal and Inland Cities in the Yangtze River Delta

Abstract: The contrasting trends of surface particulate matter (PM2.5), ozone (O3), and nitrogen dioxide (NO2) and their relationships with meteorological parameters from 2015 to 2019 were investigated in the coastal city of Shanghai (SH) and the inland city of Hefei (HF), located in the Yangtze River Delta (YRD). In both cities, PM2.5 declined substantially, while O3 and NO2 showed peak values during 2017 when the most frequent extreme high-temperature events occurred. Wind speed was correlated most negatively with PM2.5 and NO2 concentrations, while surface temperature and relative humidity were most closely related to O3. All of the studied pollutants were reduced by rainfall scavenging, with the greatest reduction seen in PM2.5, followed by NO2 and O3. By contrast, air pollutants in the two cities were moderately strongly correlated, although PM2.5 concentrations were much lower and Ox (O3 + NO2) concentrations were higher in SH. Additionally, complex air pollution hours occurred more frequently in SH. Air pollutant concentrations changed more with wind direction in SH. A more effective washout effect was observed in HF, likely due to the more frequent strong convection and thunderstorms in inland areas. This research suggests pertinent air quality control measures should be designed accordingly for specific geographical locations.

Control Theory Using in the Air Pollution Control System

Abstract: In recent years, air pollution control has caused great concern. This paper focuses on the primary pollutant SO2 in the atmosphere for analysis and control. Two indicators are introduced, which are the concentration of SO2 in the emissions (PSO2) and the concentration of SO2 in the atmosphere (ASO2). If the ASO2 is higher than the certain threshold, then this shows that the air is polluted. According to the uncertainty of the air pollution control systems model, control theory for the air pollution control systems is used in this paper, which can change the PSO2 with the method of improving the level of pollution processing or decreasing the emissions, so that air pollution system can maintain robust stability and the indicators ASO2 are always operated within the desired target.

Solid Waste, Air Pollution and Health

Abstract: While much has been written on each individual subject, very little has been published that attempts to clarify the direct and indirect associations among the incidence of air pollutant related disease, the emission of air pollutants, and their relation to solid waste generation and disposal. This study attempts to clarify these relationships. After the appropriate literature is surveyed, clarification of the total mass of air pollutants emitted by solid wastes disposal is presented. Most important, the misrepresentation of this air pollutant source, as presented in the most widely published data, is reinterpreted and clarified. The revised data show that solid waste disposal contributes more than twice as much (9.7% of total) as presented in widely published data. A development and tabulation of the relative health effects of the most prevalent air pollutants follows. Walther’s "tolerance factors" and "health effect factors" for these pollutants are presented and corrected with the use of the clarified s...

A comparative analysis of air pollutant concentrations and inflow trajectories: a case study of selected cities in South-Eastern Poland

Abstract: The paper presents a comparison of air pollutant concentrations in three cities in South-Eastern Poland (Krakow, Tarnow and Rzeszow) using statistical analyses and backward trajectory modelling (the HYSPLIT model). The analyses were based on particulate matter (PM 10 ), nitrogen dioxide (NO 2 ) and sulphur dioxide (SO 2 ) levels as well as meteorological data from year 2017. The performed analyses revealed, among others, that the PM 10 and SO 2 concentrations in the air depend on the season of the year, while the NO 2 concentrations are seasonally independent, which is mainly associated with emissions from road transport. Air quality in the analysed cities depends on local meteorological conditions and the structure of emission sources, including the inflowing background. The most unfavourable situation regarding high concentrations of PM 10 and NO 2 occurs in Krakow. For all analysed urban background stations very similar low SO 2 air concentrations are observed which proves the decreasing significance of emissions from coal combustion sources.