Fig. 2From: Neighborhood environmental factors linked to hospitalizations of older people for viral lower respiratory tract infections in Spain: a case-crossover studySummary of LRTI hospital admissions by months (green bars) and levels of ambient air pollutants (NO2, SO2, O3, PM10, and CO) by day (gray dots) in older people > 65 years from 2013 to 2015Back to article page