Descriptive data of asthma and respiratory tract infection admissions at Ljubljana Children’s Hospital, mean daily pollen count, and the concentrations of nitrogen dioxide and particulate matter with a diameter of less than 10 µm for the city of Ljubljana, Slovenia, for the observed period, 16 March to 20 April 2017–2020
| 2020 | 2019 | 2018 | 2017 | |
| Asthma admissions | 2 | 9 | 9 | 7 |
| Respiratory tract infection admissions | 20 | 41 | 49 | 63 |
| Birch pollen (grains/m3), mean SD | 148 (200) | 146 (188) | 241 (299) | 145 (198) |
| Grass pollen (grains/m3), mean SD | 5 (4) | 4 (1) | 2 (1) | 4 (2) |
| NO2 (μg/m3), mean SD | 13 (7)* | 28 (11) | 25 (9) | 31 (13) |
| PM10 (μg/m3), mean SD | 33 (39) 23 (7)† | 24 (8) | 21 (9) | 25 (12) |
European Union (EU) and WHO air quality annual mean limit values for NO2 (40 µg/m3) and MP10 (40 µg/m3, WHO 20 µg/m3).
*p<0.001 for difference between means 2020 vs 2019, 2018, 2017.
†Average PM10 concentration without 3 days, 26–29 March 2020, episode of desert dust.
NO2, nitrogen dioxide; PM10, particulate matter less than 10 µm in diameter.