air pollution is one of the most important problems in urban areas that always threaten citizen's health. photochemical smog is one of the main factors of air pollution in large cities like tehran. usually smog is not only a part of nature, but is being analyzed as an independent matter, which highly affects on the nature. it has been used as relationship between atmospheric elements such as te...

Arctic climate change inwinter is tightly linked to changes in the strength of surface temperature inversions, which occur frequently in the present climate as Arctic air masses form during polar night. Recent work proposed that, in a warmer climate, increasing low-cloud optical thickness of maritime air advected over highlatitude landmasses during polar night could suppress the formation of Ar...

OBJECTIVE To evaluate the radiological characteristics of conglomerate masses using high-resolution computed tomography of the chest. METHODS From among the patients treated between 1986 and 2004 at the Antonio Pedro University Hospital, 75 patients with silicosis and massive fibrosis, most working in the field of sandblasting, were selected for study. These patients were submitted to a clini...

Urban sprawl comprising densely populated slums over South Asian cities yields copious amounts of soot and black carbon from archaic cooking methods involving cow dung cakes firewood, which remain afloat for 10–12 h, enabling them to age in a sulphur rich environment. Not only are there toxicological concerns arising out improper ventilation mechanisms, but also other impacting the local microc...

Biological productivity in many ocean regions is controlled by the availability of the nutrient phosphorus. In the Mediterranean Sea, aerosol deposition is a key source of phosphorus and understanding its composition is critical for determining its potential bioavailability. Aerosol phosphorus was investigated in European and North African air masses using phosphorus near-edge X-ray fluorescenc...

Wet deposition is an important source of metals to the sea. The temporal variability of Hg concentrations in precipitation, and the impact of air masses of different origins over the Polish coastal zone were assessed. Samples of precipitation were collected (August 2008-May 2009) at an urbanized coastal station in Poland. Hg analyses were conducted using CVAFS. These were the first measurements...

[1] This paper presents the first results of Be and Pb specific activities in cloudwater and investigates their respective differences in cloudwater and rainwater. Our data and analysis show that temporal variation of the Be/Pb activity ratio in cloudwater are caused by multiple sources of air masses, with increased Be/Pb activity ratios corresponding to the advent of maritime or high-altitude ...

c) Comparison with ground stations: is the assumption here that the CCl4 profile is expected to be constant with altitude all the way through the troposphere? It would have been helpful to show at least a modelled CCl4 profile to support this. However, the fact that the MIPAS data have a seasonal cycle while the ground station data do not suggests that these must be different air masses, in whi...

PURPOSE To prove the feasibility of air-distended magnetic resonance colonography (MRC) and compare it with water-based distention. MATERIALS AND METHODS In five volunteers, the colon was imaged twice: once after distending the colon with air and a second time after distending the colon with water. A total of 50 patients, who had been referred to colonoscopy for a suspected colorectal patholo...