A highly significant and positive correlation of the variables UI (n = 40), temperature (n = 16) and NO 2 -concentration (n = 40) could be observed ( Fig. 2 A, B, C).
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High environmental ozone levels lead to enhanced allergenicity of birch pollen.
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The sentences
pmc-status-qastatus 0 pmc-status-live yes pmc-status-embargo no pmc-status-released yes pmc-prop-open-access yes pmc-prop-olf no pmc-prop-manuscript no pmc-prop-legally-suppressed no pmc-prop-has-pdf yes pmc-prop-has-supplement yes pmc-prop-pdf-only no pmc-prop-suppress-copyright no pmc-prop-is-real-version no pmc-prop-is-scanned-article no pmc-prop-preprint no pmc-prop-in-epmc yes pmc-license-ref CC BY Introduction Epidemiological studies show an increasing trend in allergies, leading to a major health problem.