ABSTRACT
In the last 30 years, the Metropolitan Zone of Guadalajara (ZMG) has experienced a quick urban and industrial growth, situation which results in high rates of pollution and poor air quality harmful to the health of the population. The main purpose of this work was to analyze the SO2 and NO2 in the air, as well as ions H+, SO 4-2 and NO3- during the wet season of 2005. Results of the network of monitoring stations showed significant acidity in north-northwest and southeast of the study area. The maximum concentrations of SO 4-2 occurred in southeast and south, while the maximum NO3- was found in the south. Maximum levels of SO2 and NO2 occurred in the dry season, but it decreased in wet season. The higher frequency about acidity produced by NO2 is caused by mobile sources as the primary indicator.
En los últimos 30 años, la Zona Metropolitana de Guadalajara (ZMG) ha experimentado un acelerado crecimiento urbano-industrial, realidad traducida en contaminantes nocivos para la salud de la población. El objetivo de este trabajo fue analizar la concentración de dióxido de azufre (SO 2) y de nitrógeno (NO2) en el aire, así como, los iones hidrógeno (H+), sulfatos (SO 4-2) y nitratos (NO3-) durante la temporada de lluvias del año 2005. Mediante una red de estaciones de monitoreo, se obtuvieron resultados que revelaron acidez significativa al norte-noroeste y sureste. Las concentraciones máximas de SO4-2 ocurrieron al sureste y sur, mientras que, las de NO3- se localizaron al sur. Los niveles máximos de SO2 y NO2 sucedieron en el período seco, disminuyendo en el húmedo. Se observó mayor frecuencia de acidez por NO2 siendo el indicador principal las fuentes móviles.
Subject(s)
Air Pollution , Sulfur Dioxide/analysis , Nitrogen Dioxide/analysis , Acid Rain/analysis , Hydrogen-Ion Concentration , Mexico , Public Health , Urban AreaABSTRACT
The growing trend of industrialization has marked impact on the atmospheric chemistry around the globe. Such impacts are also predicted for developing countries like India. Acid precipitation due to secondary pollutants is one of them. The present investigation was conducted with an aim of studying the precipitation chemistry over Asansol city, India during the monsoon season. The rain water samples, collected on event basis during the period of June to September 2006, were analyzed for HCO3[-], C1[-], S04[2-], NO3[-], NH4[+], K[+], Na[+], Mg[2+], Ca[2+] and pH using standard procedures. The study revealed that the precipitation was alkaline in nature with mean pH value of 6.08. Dominant anion in rain water samples was HCO3[-] [36%], whereas Ca[2+] was highest among the cations [53%]. The observed acidic events, based on pH value, were only 17%, indicating the alkaline components effectively neutralize rain water over the area. This was also supported by the total alkaline to acid ion ration of 1.05. The ratio of [NO3[-]+C1[-]] and SO4[2-] was >1, indicating that acidic properties were influenced by HNO3 and HC1. In the ratio between [Ca[2+]+NH4[+]] and [NO3[-]+SO4[2-]], values >1 were obtained, indicating significant alkaline influence, which effectively prevented acid depositions in the area