Table 5.
Average concentrations (μg m−3) and standard deviations (n = 30) of NO2, O3, and PM10 for April 2018, April 2019, and April 2020 together with the percentages of change (April 2019 versus 2018 and April 2020 and 2019)
| Average April 2018 |
Average April 2019 |
Average April 2020 |
% of change 2019 vs 2018 |
% of change 2020 vs 2019 |
|
|---|---|---|---|---|---|
| NO2 | |||||
| Gràcia | 49.2 ± 13 | 36.1 ± 10 | 19.7 ± 5 | − 27% | − 45% |
| Vall d’Hebron | 32.1 ± 10 | 25.7 ± 9 | 17.3 ± 6 | − 20% | − 33% |
| Granollers | 29.7 ± 7 | 29.7 ± 9 | 14.3 ± 5 | 0% | − 52% |
| Fabra Observatory | 13.7 ± 3 | 13.2 ± 2 | 5.0 ± 1 | − 4% | − 62% |
| Manlleu | 15.2 ± 3 | 16.5 ± 4 | 10.2 ± 2 | + 9% | − 38% |
| Begur | 3.0 ± 1 | 3.4 ± 1 | 1.9 ± 0.5 | + 13% | − 44% |
| Bellver de Cerdanya | 7.0 ± 1 | 7.8 ± 1 | 2.9 ± 1 | + 10% | − 63% |
| Juneda | 6.3 ± 2 | 8.2 ± 2 | 6.3 ± 1 | + 30% | − 23% |
| O3 | |||||
| Gràcia | 50.9 ± 23 | 61.1 ± 20 | 68.2 ± 20 | + 20% | + 12% |
| Vall d’Hebron | 62.1 ± 23 | 77.2 ± 25 | 70.6 ± 20 | + 24% | − 9% |
| Granollers | 55.5 ± 25 | 63.2 ± 31 | 64.9 ± 21 | + 14% | + 3% |
| Fabra Observatory | 88.8 ± 7 | 97.3 ± 8 | 92.2 ± 9 | + 10% | − 5% |
| Manlleu | 52.8 ± 19 | 60.1 ± 26 | 49.2 ± 18 | + 14% | − 18% |
| Begur | 101.0 ± 6 | 96.6 ± 7 | 83.2 ± 7 | − 4% | − 14% |
| Bellver de Cerdanya | 67.9 ± 18 | 70.2 ± 19 | 51.3 ± 13 | + 4% | − 27% |
| Juneda | 60.0 ± 23 | 68.9 ± 26 | 58.0 ± 23 | + 15% | − 16% |
| PM10 | |||||
| Gràcia | 31.7 ± 19 | 22.5 ± 10 | 16.8 ± 8 | − 29% | − 25% |
| Vall d’Hebron | 23.6 ± 13 | 27.2 ± 18 | 11.0 ± 6 | + 15% | − 60% |
| Granollers | 27.3 ± 15 | 23.8 ± 9 | 17.7 ± 6 | − 13% | − 26% |
| Fabra Observatory | n.d | 15.4 ± 9 | 12.1 ± 7 | n.d | − 21% |
| Manlleu | 23.1 ± 13 | 18.4 ± 9 | 15.1 ± 7 | − 20% | − 18% |
| Begur | n.d | 10.2 ± 5 | n.d | n.d | n.d |
| Bellver de Cerdanya | 17.3 ± 13 | 10.4 ± 8 | 10 ± 6 | − 40% | − 4% |
| Juneda | 23.5 ± 17 | 18.2 ± 12 | 14.0 ± 7 | − 23% | − 23% |
n.d. no data available