(9)The Portal should provide the public with free-of-charge online access to a more integrated and coherent dataset on key environmental pressures generated by industrial installations, since such data constitute a cost-effective tool for drawing comparisons and taking decisions in relation to environmental matters, encouraging better environmental performance, tracking trends, demonstrating progress in pollution reduction, benchmarking installations, monitoring compliance with relevant international agreements, setting priorities and evaluating progress achieved through Union and national environmental policies and programmes.