Skip to main content
Figure 2 | Environmental Health

Figure 2

From: PM2.5 in Beijing – temporal pattern and its association with influenza

Figure 2

Distribution of PM 2.5 concentrations and days with 24-hr averages exceeding the standards. Top – frequency distribution of days with varying 24-hr average concentrations for the whole study period; black line – the WHO standard (25 μg/m3), redline – the EPA standard (35 μg/m3), green – the SEPA standard (75 μg/m3). Bottom – distribution of days each month with the 24-hr averages exceeding the standards by the WHO (red), the EPA (green) and SEPA (blue). The gap between December 2008 and February 2009 was due to missing measurements.

Back to article page