Disposal of Dangerous Chemicals in Urban Areas and Mega Cities formatIsbn:Hardcover 9789400750333 to evaluate the hith erto the 24th ER Conference to evaluate the hith erto accumulated information Pitääkö sitä aina olla johonkin lähdössä A comprehensive overview on the methods used to measure nitrogen oxides and acids in the troposphere is given and difficulties and artefacts associated with the use of the techniques for measurements in urban and mega city environments is illustrated in conjunction with modelling studies which attempt to simulate the field observations using state of the art knowledge on the chemistry of the VOCs and radical levels