Abstract

Inorganic particulate matter was sampled weekly during the period April 1985–April 1986 in Isa Town, Bahrain. The mean annual conductivity of water-soluble inorganic particulate matter was 59.99 μScm −1; pH 7.5; total suspended solid 0.06 gdm −3; total dissolved solid 63.79 ppm; total hardness as MgCO 3 86.80 ppm; as CaCO 3 208.05 ppm; Cl − 111.27 ppm; Na + 2.18 ppm; and NO 3 − 0.006 M. Each shows seasonal variations in concentration. The average aerosols maxima were recorded in summer. The total suspended solid (TSS) mode of aerosol displays some change, with a mean in winter of 0.039 gdm −3 and a mean value in summer of 0.044 gdm −3. The aerosols data were influenced differently by some atmospheric parameters such as temperature, humidity, wind speed and direction.

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