Kollam — AQI Trends
Year-over-year AQI trajectory for Kollam (2020–2024). Based on CPCB station data, 2016–present.
Kerala · Live Kollam AQI →
Kollam — annual AQI 2020–2024
Year × month heatmap
Worst single days on record
- 2024-04-06Polayathode Kollam (PCB)272
- 2020-12-03Polayathode Kollam (PCB)272
- 2023-11-13Polayathode Kollam (PCB)259
- 2024-01-16Polayathode Kollam (PCB)249
- 2021-01-30Polayathode Kollam (PCB)237
- 2020-11-27Polayathode Kollam (PCB)235
- 2020-12-29Polayathode Kollam (PCB)232
- 2023-12-24Polayathode Kollam (PCB)226
- 2023-12-16Polayathode Kollam (PCB)223
- 2024-10-31Polayathode Kollam (PCB)220
What the numbers say
Overview
Kollam's AQI moved from 86 in 2020 to 84 in 2024 — a fall of 2.3% over 4 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 Kollam was 2021 at AQI 93, while the best was 2022 at AQI 76. The city has posted 1.1% of all measured days above AQI 200 (the Poor threshold), and its worst recorded single day hit 272 on 6 Apr 2024.
Why this pattern
Kollam'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.