Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

The second aim of the report is to contribute to the development of internationally comparable indicators to measure progress.

This volume studies the risk to the environment and human health posed by nitroPAHS. Data on the in vivo genotoxicity of nitroPAHs are available for 15 nitroPAHs. All nitroPAHs that gave positive results in vivo were also positive in vitro. Four nitroPAHs that were positive in in vitro genotoxicity tests revealed inconsistent or inconclusive genotoxicity (2-nitronaphthalene, 5-nitroacenaphthene and 3-nitrofluoranthene) or negative genotoxicity (2,7-dinitrofluorene; limited validity) results in vivo. There are no reports on the effects of individual nitroPAHs on humans. As would be expected, since nitroPAHs occur in complex mixtures in the atmosphere and exhaust, the exact contribution of nitroPAHs to the adverse health consequences of exposure to polluted atmospheres and to exhaust cannot be elucidated.

For years, the problem of child labour has been overwhelming, its solution hopeless. Yet recently, there is a worldwide perception that at least the most unacceptable forms of child labour must be and can be eradicated within a short time frame. This would set in motion an irreversible process leading to the total elimination of all forms of child labour. In order to visualize and move towards this ultimate goal, it is important to collect, assess and act upon child labour statistics. This report aims at setting standards of good practice on the collection, compilation and analysis of national child labour statistics, guiding countries to update their existing statistical system in this field or to establish a new one where necessary.