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The greatest contraction was for PM2.5 in April and May with reductions of -11.1% to -26.4% and from -8.7 to -21.1% respectively. For PM10, the reductions were from -8.6% to -33.9% and from -8.5% to -31.5% as compared to the same months in 2019. The results showed that restrictions imposed to prevent the spread of COVID-19 significantly improved Poland's air quality. Greenness may protect from or contribute to allergy risk by influencing air pollution and human-microbe interactions. However, existing research on the issue is heterogene