Fig. 3From: Variation of major air pollutants in different seasonal conditions in an urban environment in MalaysiaDaily exceedance level of air pollutants (a CO b O3 c NO2 d SO2 e PM10) between 2005 and 2015 with respect to averaging time according to Malaysia Ambient Air Quality Standard (MAAQS) and USEPA National Ambient Air Quality Standard (NAAQS). The total occurrence of daily exceedance is stated in the figure for 2005–2015Back to article page