Published Week Day and Week End Air Ion Variability at Rural station Ramanandnagar (17° 4’ N 74° 25’E), India and At Different Atmospheric Sites in India by Pawar S.D., Meena G.S. and Jadhav D.B.
Published Analysis of the 11-year Record (1987-1997) of Air Pollution measurements in Athens, Greece. Part I: Primary air pollutants by Kalabokas P.D., Viras L.G., Repapis C.C.