Guwahati — AQI Trends
Year-over-year AQI trajectory for Guwahati (2019–2024). Based on CPCB station data, 2016–present.
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Guwahati — annual AQI 2019–2024
Year × month heatmap
Worst single days on record
- 2023-01-15Railway Colony (PCBA)420
- 2019-08-13Railway Colony (PCBA)415
- 2021-01-14Railway Colony (PCBA)402
- 2020-01-15Railway Colony (PCBA)393
- 2023-01-16Railway Colony (PCBA)392
- 2019-05-26Railway Colony (PCBA)379
- 2021-03-26Pan Bazaar (PCBA)378
- 2023-09-01LGBI Airport (PCBA)373
- 2024-01-15Pan Bazaar (PCBA)370
- 2020-02-16Railway Colony (PCBA)369
What the numbers say
Overview
Guwahati's AQI moved from 109 in 2019 to 123 in 2024 — a rise of 12.8% over 5 years. The long-run trend is worsening, with a regression slope of 2.7 AQI points per year.
The data story
The worst recorded year in Guwahati was 2023 at AQI 135, while the best was 2019 at AQI 109. The city has posted 25.6% of all measured days above AQI 200 (the Poor threshold), and its worst recorded single day hit 420 on 15 Jan 2023.
Why this pattern
A worsening trend in Guwahati typically reflects rapid urbanisation, vehicle fleet growth outpacing Bharat Stage VI emission benefits, expanding industrial activity, and in some cases new construction dust. The data points the finger at what policy needs to target next: year-round baseline emissions, not just the winter peak.
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.