2000 Volume 1 Issue 1 Pages 15-17
Study on anusual air pollusion of NO2[1] at the localized small area in Suginami-ku, Tokyo, Japan have shown [2] Nitrogen dioxide is present at small area such as main industrial streets, staying in winter for longer time than in summer, gathering at lower side. It is caused of its weight, because NO2 is heavier than O2 or N2 (O2:N2 :NO2= 32:28:46≒2:2:3).