Howrah — AQI Trends
Year-over-year AQI trajectory for Howrah (2016–2024). Based on CPCB station data, 2016–present.
West Bengal · Live Howrah AQI →
Howrah — annual AQI 2016–2024
Year × month heatmap
Worst single days on record
- 2017-04-15Ghusuri (WBPCB)500
- 2016-09-04Ghusuri (WBPCB)500
- 2016-08-30Ghusuri (WBPCB)500
- 2016-08-12Ghusuri (WBPCB)500
- 2016-08-05Ghusuri (WBPCB)500
- 2016-07-20Ghusuri (WBPCB)500
- 2016-07-12Ghusuri (WBPCB)500
- 2021-12-16Ghusuri (WBPCB)429
- 2019-11-06Ghusuri (WBPCB)423
- 2019-12-24Ghusuri (WBPCB)422
What the numbers say
Overview
Howrah's AQI moved from 158 in 2016 to 126 in 2024 — a fall of 20.3% over 8 years. The long-run trend is roughly stable, with a regression slope of -1.7 AQI points per year.
The data story
The worst recorded year in Howrah was 2016 at AQI 158, while the best was 2017 at AQI 101. The city has posted 29.999999999999996% of all measured days above AQI 200 (the Poor threshold), and its worst recorded single day hit 500 on 15 Apr 2017.
Why this pattern
Howrah's trend has been stable — neither clearly worsening nor clearly improving. That stability often masks underlying growth in emissions being offset by cleaner vehicle technology or weather variability. The NCAP era from 2019 onward is the key policy backdrop; stability here means targets have not yet translated into measurable ground-level change.
What to do with this
For planners and residents, the trend matters as much as today's number. A worsening city needs aggressive source control and personal protection investments like indoor purifiers. An improving city rewards continued policy pressure but still requires caution during peak months. Use the live AQI page for day-to-day decisions and this chart for multi-year context. Year-over-year change of more than 10% in either direction is typically real signal, not noise.