Table 1.
PM2.5 levels in some of the most polluted cities of the world during the period of COVID-19-induced lockdown
| City | Average PM2.5 during lockdown 2020 (µg/m3) |
Reduction Compared to 2019 |
Average reduction compared to prior 4 years |
Lockdown period, 2020 |
|---|---|---|---|---|
| Delhi, India | 32.8 | − 60% | − 55% | March 23–April 13 |
| London, UK | 16.2 | − 9% | + 6% | March 23–April 13 |
| Los Angeles, US | 5.5 | − 31% | − 51% | March 23–April 13 |
| Madrid, Spain | 6.4 | − 11% | + 2% | March 23–April 13 |
| New York City, US | 4.4 | − 25% | − 29% | March 23–April 13 |
| São Paulo, Brazil | 10.1 | − 32% | − 26% | March 23 − April 13 |
| Seoul, South Korea | 24.1 | − 54% | − 32% | Feb 26–March 18 |
| Wuhan, China | 35.1 | − 44% | − 50% | Feb 3–Feb 24 |
| Lahore, Pakistan | 25 | − 63% | − 59% | March 23–April 13 |