Figure 1From: Particulate matter air pollution and respiratory symptoms in individuals having either asthma or chronic obstructive pulmonary disease: a European multicentre panel study Odds ratio (95% CI) for prevalence of symptoms and limitation in activities associated with an increase of 10 μg/m 3 in previous day (lag1) concentrations of each pollutant (10,000/cm 3 for PNC) in each participating city and overall estimate (random effects pooled estimates). Back to article page