China has experienced very rapid economic development in recent yearsUrban air has very high concentrations of various pollutants, including sulphur dioxide (SO2), oxides of nitrogen (NOx), ozone (O3) and particulate. This paper reviews the changes in air quality in the cities like Guangzhou over the past 15 years, and notes that a serious vehicular-related emissions problem has been superimpos...

This paper examines the significant differences in seasonal variations of air pollutants concentrations at urban, industrial, commercial and agricultural areas of Uttarakhand. PM10 (RSPM), suspended particulate matter (SPM), sulphur dioxide (SO2) and oxides of nitrogen (NOx) were collected over four sites in Haridwar and Dehradun Valley, Uttarakhand. The first one, Shivalik Nagar, Haridwar is a...

BACKGROUND Occupational exposure to irritants is associated with chronic bronchitis. The aim of this study was to elucidate whether repeated peak exposures with respiratory symptoms, gassings, to sulphur dioxide (SO2) and other irritant gases could increase the risk of chronic bronchitis. METHODS The study population comprised 3,060 Swedish pulp mill workers (84% males) from a cohort study, w...

BACKGROUND We conducted this study in Budapest, Hungary, to better characterize the effects of exposure to ambient air pollutants on the lung function of asthmatic children. METHODS The 60 study participants were 9-14 years old, had physician-diagnosed asthma, and were symptomatic during the previous year. Their ambient air pollutant exposures to total suspended particulates (TSP) and sulphur...

Sulphuric acid (H2SO4) is one of the most produced chemicals in world. The critical step sulphuric production oxidation sulphur dioxide (SO2) to trioxide (SO3) which takes place a multi catalytic bed reactor. In this study, representative kinetic rate equation was rigorously selected develop mathematical model perform multi-objective optimization (MOO) objectives MOO were SO2 conversion, SO3 pr...

A survey of X-ray film processing departments revealed the main airborne contaminants to be sulphur dioxide and acetic acid at concentrations of about 0.1 ppm. Glutaraldehyde was not detected either in the ambient air or in the exhaust duct from an automatic film processor. Laboratory studies confirmed sulphur dioxide and acetic acid as the main headspace constituents above working strength pro...

Sulfur dioxide (SO2) is a problematic inhalable air pollutant in areas of widespread industrialization, not only in the United States but also in countries undergoing rapid industrialization, such as China, and it can be a potential trigger factor for asthma exacerbations. It is known that asthmatics are sensitive to the effects of SO2; however, the basis of this enhanced sensitivity remains in...

Background: Sulfur dioxide is one of the important pollutants that at the present time cause irreparable damage to environment and human health. The aim of present study was to study and comparison the effects of SO2 on respiratory and cardiovascular deaths in Bushehr city. Materials and Methods: This analytical study was conducted in Bushehr city during 2011. In the first stage data were colle...

This paper introduces two changes of the turbulence parameterization for the EMEP (European Monitoring and Evaluation Programme) Eulerian air pollution model: the replacement of the Blackadar in stable and O’Brien in unstable turbulence formulations with an analytical vertical diffusion profile (K(z)) called Grisogono, and a different mixing height determination, based on a bulk Richardson numb...

Many epidemiological studies have shown positive short-term associations between health and current levels of outdoor air pollution. The aim of this study was to investigate the association between air pollution and the number of visits to accident and emergency (A&E) departments in London for respiratory complaints. A&E visits include the less severe cases of acute respiratory disease and are ...