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Exposure to green space and pollen allergy symptom severity: A case-crossover study in Belgium
to birch pollen concentration (100 grains/m3) [adjusted odds ratio 1.045 and 95% confidence interval (1.014-1.078)], O3 concentration (10 μg/m3) [1.504 (1.281-1.766)] and PM10 concentration (10 ...