Table 1.
Mean concentration in (µgm−3) recorded by LMA air quality monitoring network for the following periods: A: Mar 16-Apr 30, 2017–19 (three-year mean); B: Feb 1-Mar 15, 2020 (pre-lockdown) and C: Mar 16-Apr 30, 2020 (during lockdown)
| Station ID | A: Mar 16-Apr 30, 2017–19 (3-year mean) |
B: Feb 1-Mar 15, 2020 (pre-lockdown) |
C: Mar 16-Apr 30, 2020 (during lockdown) |
C-A: Relative change ([C-A] × 1–00/C, %) |
C-B: Relative change ([C-B] × 100/C, %) |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 | PM2.5 | NO2 | O3 | PM10 | PM2.5 | NO2 | O3 | PM10 | PM2.5 | NO2 | O3 | PM10 | PM2.5 | NO2 | O3 | PM10 | PM2.5 | NO2 | O3 | |
| CDM | 28 | 15 | - | 22 | 26 | 15 | - | 53 | 19 | 13 | - | 59 | -32 | -13 | - | 170 | -24 | -14 | - | 11 |
| SBJ | 52 | 15 | - | - | 32 | 14 | - | - | 24 | 11 | - | - | -54 | -23 | - | - | -26 | -19 | - | - |
| CRB | 98 | 27 | - | - | 90 | 22 | - | - | 50 | 12 | - | - | -49 | -55 | - | - | -44 | -45 | - | - |
| SJL | - | 31 | - | - | - | 17 | - | - | - | 11 | - | - | - | -64 | - | - | - | -37 | - | - |
| STA | 82 | - | 19 | - | 33 | - | 19 | - | 22 | - | 10 | - | -73 | - | -48 | - | -45 | - | -46 | - |
| VMT | 182 | 27 | 21 | - | 129 | 29 | - | - | 71 | 20 | - | - | -61 | -26 | - | - | -34 | -31 | - | - |
| AVG | 88 | 24 | 20 | 22 | 62 | 20 | 19 | 53 | 37 | 14 | 10 | 59 | -58 | -43 | -48 | 170 | -40 | -31 | -46 | 11 |