Archive · 26 May 2025
Kolkata Air Quality Improved in Winter 2024-25
Kolkata's air was a little cleaner this past winter, the best since 2019, but it still has a long way to go.
PM2.5, tiny particles in the air that can make you sick, decreased in December and January.
The levels are still higher than what's considered safe.
This improvement is likely due to cleaner cars and more people knowing about air pollution.
Air quality is usually better during the summer.
Experts warn that to keep the air clean, things like green transport and clean energy are needed.
Air pollution can be a health risk, particularly for those who are vulnerable.
Kolkata recorded its best particulate pollution levels since 2019 during the winter of 2024-25.
PM2.5 levels in December 2024 were 73 µg/m³.
PM2.5 levels in January 2025 were 77 µg/m³.
These levels, while improved, still exceed the national safe limit of 40 µg/m³.
Experts warn that more sustainable interventions are needed for long-term air quality improvement.
- Who
- West Bengal Pollution Control Board (WBPCB) analyzed the data and experts have warned about the need for continuous intervention
- What
- Kolkata recorded its best PM2.5 levels since 2019 during the winter months, though pollution still exceeds safe limits.
- When
- Winter of 2024-2025
- Where
- Kolkata
- Why
- Lower wind speeds, temperature inversions, and increased emissions from vehicles and burning biomass contribute to winter pollution. The decline in pollution likely resulted from stricter emission norms, cleaner fuels, and increased public awareness.
- Dec 2024 PM2.5 Level
- 73 µg/m³
- Jan 2025 PM2.5 Level
- 77 µg/m³
- National Safe Limit for PM2.5
- 40 µg/m³
- Best PM2.5 Levels Since
- 2019
- Lowest Pollution Level (July 2023-24)
- 13 µg/m³