@Article{acpd-12-31767-2012,
AUTHOR = {Hilboll, A. and Richter, A. and Burrows, J. P.},
TITLE = {Long-term changes of tropospheric NO$_{2}$ over megacities derived from multiple satellite instruments},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {12},
YEAR = {2012},
NUMBER = {12},
PAGES = {31767--31828},
URL = {http://www.atmos-chem-phys-discuss.net/12/31767/2012/},
DOI = {10.5194/acpd-12-31767-2012}
}