Mumbai's Cleanest and Most Polluted Areas: 29 Stations Ranked

86 AQI points. That is the gap between Borivali East and Worli in 2024. Same city, same monsoon, same traffic jams. One area averaging Good air, the other stuck in Moderate-to-Poor territory all year.

Mumbai now has 29 air quality monitoring stations spread across the city, up from just 1 in 2016. For the first time, we can compare neighbourhood-level air quality across South Mumbai, the Western Suburbs, the Eastern Suburbs, and the central corridor. We dug into 25,472 daily CPCB readings spanning 8 years to rank every monitored area.

The results are not what most Mumbaikars would expect.

How We Measured This

We pulled daily AQI data from all 29 CPCB stations operating in Mumbai between 2016 and 2024. Four metrics drive the rankings:

Data source is CPCB continuous ambient monitoring stations. Note: 2023 data is unavailable nationwide due to a CPCB data gap, so we compare 2021, 2022, and 2024 for year-on-year trends.

The Full Ranking: 29 Stations, Worst to Best

Here is every Mumbai monitoring station ranked by 2024 average AQI. The colour tells the story: green is clean, orange and red are not.

Two stations, BKC IITM and Bandra MPCB, lack 2024 data and are excluded from the ranking.

Worli's 148 average is not even close to the rest. It is the only station to average above "Moderate" for the full year. At the other end, Borivali East MPCB hit 62, firmly in "Satisfactory" territory with nearly half its days in the "Good" category.

A few things jump out. Same location, different operator, very different readings: the two Borivali East stations, IITM and MPCB, barely 500 metres apart, report a 54-point gap. This is likely a measurement methodology issue between IITM and MPCB instruments, and it repeats across the city. Every IITM station reads higher than its nearest MPCB neighbour.

Where You Breathe Matters: Geographic Zones

We grouped stations into four broad zones. The average masks real variation within each zone, but the pattern is clear.

South Mumbai being the dirtiest zone surprises most people. Colaba's sea breeze keeps its MPCB station clean at 74 AQI, but Worli, Mazgaon, and Navy Nagar, all IITM stations, push the zone average up. Port activity, refinery proximity near Sewri, and dense traffic corridors through Lower Parel and Worli all contribute.

The Eastern Suburbs clock in lower than expected. Deonar, home to Asia's largest dumping ground, averages 97 rather than the 150+ you might assume. But cleaner pockets like Bhandup West at 72, Ghatkopar at 82, and Powai at 80 pull the zone down. The IIT campus at Powai clearly benefits from lakeside location and tree cover.

How Rankings Shifted: 2021 to 2024

This animated chart shows how station rankings changed across the three most reliable data years. Hit play to watch the bars re-sort. Some stations improved dramatically; others slid backward.

Watch Worli. In 2021 it was middling at 84 AQI, almost matching Colaba. By 2024 it shot to 148, the worst in the entire city, a 76% jump. Something changed in Worli's immediate environment, whether increased construction activity with the coastal road project, traffic rerouting, or an instrument calibration shift.

Most MPCB stations tell the opposite story. Vile Parle dropped 39 points, Kurla dropped 48, Mulund dropped 36. Whether this reflects real improvement or post-COVID traffic patterns resettling, 2024 was a significantly better year for the western and eastern suburbs compared to 2021-2022.

Mumbai's Monitoring Network Growth

Mumbai went from 1 lonely station in Bandra in 2016 to 27 active stations in 2024. The big jumps came in 2019, when MPCB expanded from 1 to 9, in 2020-2021 when IITM added their research-grade stations, and in 2024 when BMC finally entered with 5 new stations.

Three operators run these stations:

Blind spots remain. Navi Mumbai's growing suburbs, the entire Thane-Dombivli corridor, and most of Mumbai's northern exurbs still have no CPCB monitoring. When the BMC added Ghatkopar and Byculla in 2024, those became the first stations covering central-east Mumbai, areas with millions of residents who previously had no local air quality data.

The Monsoon Rescue: Seasonal Patterns

Every Mumbai station follows the same seasonal rhythm: monsoon months bring the cleanest air, winter brings the worst. But the magnitude of that swing varies wildly between areas.

Mazgaon has the biggest swing in all of Mumbai: 161 AQI points between monsoon and winter. During July-August, even Mazgaon drops below 60. Come December, it crosses 200. That 3.9x multiplier means residents of Mazgaon experience two completely different cities depending on the season.

At the other extreme, Bhandup West has the smallest swing at 69 points. Its AQI stays relatively stable year-round, suggesting less exposure to seasonal inversion effects and the industrial sources that spike in cold weather.

The Good Days Scorecard

Forget averages for a moment. How many days did each area actually have "Good" air, AQI 50 or below, in 2024? This is the metric that matters for daily life: can you go for a morning jog, open your windows, let your kids play outside?

Kandivali West stands out with 161 Good days in 2024. That is more than many hill stations. For about 5 months of the year, Kandivali West's air quality would be considered good even by European standards. Contrast that with Worli's 7 Good days. Seven. Even optimistic Mumbaikars would struggle to find a silver lining there.

Year-over-Year Trends: Who Improved, Who Got Worse

Looking at 18 stations with data across 2021, 2022, and 2024, most improved. Of the 18, 15 showed lower AQI in 2024 compared to 2021. Three got worse, with Worli the standout deterioration.

The city-wide story is cautiously positive. If you strip out Worli, which looks like an outlier or instrument issue, the average across remaining stations dropped from 116 in 2021 to 88 in 2024. That is a 24% improvement in three years.

But Worli's trajectory demands investigation. A 76% increase in average AQI while the rest of the city improved is unusual. Possible explanations include the Coastal Road construction generating massive quantities of particulate matter, changes in local traffic routing, or instrument calibration drift. IITM and MPCB should jointly audit this station.

The Operator Gap: IITM Reads Higher

One pattern is impossible to ignore: IITM stations consistently report higher AQI values than MPCB or BMC stations in the same areas.

This is a well-known issue nationally. IITM uses continuous monitoring with beta-attenuation method instruments, while MPCB often uses gravimetric samplers. The instruments are measuring the same air, but BAM tends to read higher for PM10, which is Mumbai's dominant pollutant. Neither method is wrong, but direct comparisons between IITM and MPCB readings should come with an asterisk.

What This Means If You Live in Mumbai

The data suggests some practical takeaways if air quality factors into your daily decisions:

The gap between Mumbai's cleanest and most polluted areas is large enough to meaningfully affect health outcomes. A resident of Borivali East breathing Good air for 149 days a year has a fundamentally different long-term exposure profile than someone in Worli with 7 Good days. Same city, different reality.

Track real-time air quality for Mumbai, Navi Mumbai, Pune, or Delhi on aqinow.co.