Vellore — AQI Trends
Year-over-year AQI trajectory for Vellore (2022–2024). Based on CPCB station data, 2016–present.
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Vellore — annual AQI 2022–2024
Year × month heatmap
Worst single days on record
- 2024-01-14Vasanthapuram (TNPCB)245
- 2023-11-13Vasanthapuram (TNPCB)244
- 2023-12-22Vasanthapuram (TNPCB)235
- 2024-12-17Vasanthapuram (TNPCB)222
- 2023-12-23Vasanthapuram (TNPCB)216
- 2023-12-20Vasanthapuram (TNPCB)195
- 2023-12-24Vasanthapuram (TNPCB)194
- 2024-12-16Vasanthapuram (TNPCB)191
- 2022-12-08Vasanthapuram (TNPCB)168
- 2023-11-16Vasanthapuram (TNPCB)162
What the numbers say
Overview
Vellore's AQI moved from 71 in 2022 to 61 in 2024 — a fall of 14.1% over 2 years. The long-run trend is improving, with a regression slope of -5.0 AQI points per year.
The data story
The worst recorded year in Vellore was 2023 at AQI 93, while the best was 2024 at AQI 61. The city has posted 1.7% of all measured days above AQI 200 (the Poor threshold), and its worst recorded single day hit 245 on 14 Jan 2024.
Why this pattern
The improving direction mirrors national NCAP (National Clean Air Programme) targets introduced in 2019, which aimed for a 20–30% PM reduction by 2024. Cleaner fuels, tighter vehicle standards, and the 2020 COVID lockdown year all show up in the yearly series. Sustained reduction past 2024 will depend on continued enforcement, industrial fuel switching, and controlling seasonal spikes from biomass burning and festivals.
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.