eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 June 2008 4 1 47 52 juc 759 article R.A. ETIUMA 1 I.E. UWAH 1 A. U. ETIUMA 2 Department of Chemistry, University of Calabar, Calabar, Cross River State (NIGERIA) Cardithoracic Unit, Department of Surgery, University of Calabar, Cross River State (NIGERIA) <p>&nbsp;</p> <table border="0" cellpadding="5" cellspacing="0" style="width:100%"> <tbody> <tr> <td> <p style="text-align: justify;">Measurement of NO₂ in different indoor hostels environments was carried out. Crowcon portable Gasman automatic monitor was used for the monitoring. The highest NO₂ concentration of 0.267ppm was obtained in hostels 4 and 8 while the lowest concentration of 0.133 was obtained in a first floor room in hostel 5. The FEPA limit of 0.016ppm for NO₂ was exceeded in all the locations sampled in this study. Levels obtained in this study therefore suggest the need for urgent intervention. However, the outdoor concentration of NO₂ around the hotels was almost the same as that obtained indoors. This suggests high penetration of indoors of outdoor NO₂.<br /> Crowcon monitors.</p> </td> </tr> <tr> <td> <p>&nbsp;</p> </td> </tr> </tbody> </table> https://journalofchemistry.org/paper/759/ Nitrogen dioxide Air Pollution Crowcon monitors.