During the first 5weeks of the state’s lockdown for coronavirus disease 2019 (COVID-19), from 16 March to 20 April 2020, we observed a 71% to 78% decrease in paediatric asthma admissions compared with the same time periods in the last 3 years. Regarding common asthma attack triggers, there was a 51% to 68% decrease in admissions for acute respiratory tract infections. Airborne pollen concentrations were within seasonally expected limits. A 48% to 58% reduction in the air nitrogen dioxide (NO2 ) level was detected, but concentrations of particulate matter with a diameter of less than 10μm (PM10) did not change substantially (table 1).
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