Maxima for NO_x (episodes)

Unit: µg(NO2)/m3	NO2 (hour)     1997
Traffic: Copenhagen/1257 Odense/9155 Aalborg/8151 Urban backgr.: Copenhagen/1259 Odense/9159 Aalborg/8159 Rural: Ll. Valby/2090 Keldsnor/9055	Max. 3 hours Day:hour Max. hour Day:hour 124 970814:19 140 970814:19 134 970814:13 146 970814:16 125 970820: 7 137 970820: 7   95 970117: 6 128 970814:21 92 970115:15 126 970814: 8 99 970321: 6 130 971104: 2   85 970117: 5 89 970117: 5 94 970116:17 99 970116:18
Warning limit	350       -       -       -

The warning limit is a part of the national smog warning system.
With reference to the warning limit crirerias the lowest one hour value is identified for every consequtive three hour period. The highest of these one hour values are listed in the table in the column Max. 3 hour.

Overview of NO_x