Summary
Formerly dominated by cities with the worst air pollution, research now shows that parts of India have reasonable to good air quality. In particular, most of the cities listed as the least polluted were located in Tamil Nadu. Other than cities in Tamil Nadu, a few are located in Karnataka and Meghalaya, indicating that, more often than not, the most favourable geographical locations are where smaller to medium-sized municipalities achieve higher air quality. It is noted that locations with lower traffic density, less intense industrial development, more vegetation, and better meteorological and topographical influences on airflow generally have the highest air quality. The cities examined in this report can help others determine the best policies and topographical advantages to improve air quality in regions where pollution levels are much higher than in these cities.
Top 10 Least Polluted Cities in India: Find Out Where the Air is Fresh.
When we think about air pollution in India, densely populated cities like Delhi and Mumbai often come to mind. In the previous article, I discussed the top 10 most polluted cities in the world in 2025. But what if I told you there are hidden gems in India leading the way in clean air? Are you looking for the cleanest city in India to escape air pollution? So, Today, I came up with the least polluted city in India. In a nation where industrialization and rapid urbanization have frequently caused environmental issues, some areas stand out for their dedication to maintaining clean, fresh air.
Imagine waking up to the chirping of birds, enjoying outdoor activities without the constant worry of air quality, and feeling rejuvenated by the clean atmosphere around you. In this blog, we’ll take a closer look at the least air-polluted cities in India.
Picture yourself in a city where the air is crisp, the sky is clear, and every breath feels refreshing. While much of India struggles with air pollution, there are still places where you can experience clean air. Let’s explore the top 10 least polluted cities in India and uncover what makes them special.
Top 10 least polluted cities in India
These locations are establishing standards for sustainable living. Continue reading to find out more!
| Rank | City | State | AQI |
|---|---|---|---|
| 1 | Ariyalur | Tamil Nadu | 10–20 |
| 2 | Ooty | Tamil Nadu | 12–20 |
| 3 | Karur | Tamil Nadu | 14–20 |
| 4 | Tiruchirappalli | Tamil Nadu | 14–22 |
| 5 | Thanjavur | Tamil Nadu | 15–22 |
| 6 | Shillong | Meghalaya | 15–25 |
| 7 | Perundurai | Tamil Nadu | 18–25 |
| 8 | Tirupur | Tamil Nadu | 18–26 |
| 9 | Salem | Tamil Nadu | 18–26 |
| 10 | Davanagere | Karnataka | 22–30 |
Pollution Levels Vary Daily → Think of air quality like the stock market, constantly changing based on environmental and human factors. This is why real-time monitoring is crucial for making informed decisions about outdoor activities and health.
1.Ariyalur, Tamil Nadu
- Ariyalur regularly has an AQI (Air Quality Index) of 10 to 20, consistently indicating “good” air quality, making it one of the best places in India to breathe clean air.
- The PM₂.₅ levels in Ariyalur are very low, providing residents with an excellent opportunity to enjoy more outdoor activities, such as walking and biking, without the risk of respiratory problems.
- This shows that smaller cities with balanced growth can maintain the same air quality as larger cities with multiple industries and higher levels of air pollution.
2.Ooty, Tamil Nadu
- Located more than 2200 metres above sea level in the Nilgiri Hills, Ooty is popular for its cool climate and beautiful scenery, including dense forests and wonderful views. Its high elevation and steady stream of mountain air regularly carry pollution away from the area.
- Most of the year, the air is clean, even at peak tourist times.
- Because there are no large industrial facilities in or around Ooty and protected green spaces, the level of pollution (as measured by PM₂.₅) remains very low.
- The example of Ooty demonstrates that if development is carefully managed, hill towns can maintain Cleaner Air and support the health of their residents.
3.Karur, Tamil Nadu
- Located in Tamil Nadu, Karur is not large; however, it has significant farming and textile industries.
- The level of pollution is relatively low compared to nearby sites. Based on data, Karur typically has an AQI rating of 14-20 and is considered to be ‘Good’ air quality. Also, the PM₂.₅ levels are below the action level, therefore providing very few health risks to
- Karur is a great example of how industrial activity, when controlled, does not necessarily lead to high levels of air pollution. The air quality is maintained through lower vehicle traffic, the presence of open land, and controlled industrial activity, and thus, at times, aided by seasonal winds.
4.Tiruchirappalli, Tamil Nadu
- Among other things, Tiruchirappalli (Trichy) is a centre of education and culture in India, but it’s also one of the cleanest cities in India.
- According to air-quality ratings, Trichy’s average AQI is between 14 and 22, which is designated as “Good.” The PM₂.₅ levels are significantly lower than those of major metropolitan areas.
- The combination of having developed and constructed broader streets to allow greater air movement due to the presence of the Cauvery River Basin and a lower density of industries that produce high levels of pollution creates ideal conditions for maintaining relatively good levels of air quality.
5.Thanjavur, Tamil Nadu
- Thanjavur is renowned for its cultural history and agricultural environment, and benefits from a more pristine atmosphere than other areas due to its rural landscape and limited amount of industry.
- Current AQI readings in Thanjavur range from 15 to 22, indicating “Good” air quality. The agricultural land surrounding the city helps reduce dust and particulate matter typically found in urban areas of higher density.
- In addition to lower traffic volumes, the substantial number of open areas significantly reduces air contaminants by dispersing them.
- There is sufficient protection against PM₂.₅ levels that outdoor activities can be conducted with little to no risk to participants.
6.Shillong, Meghalaya
- Shillong, often called the “Scotland of the East,” sits at an elevation of around 1,500 meters and is surrounded by forests and rolling hills.
- The city usually records an AQI between 15 and 25, classified as ‘Good’.
- High rainfall, dense greenery, and minimal industrialisation help keep PM₂.₅ levels low. Natural ventilation plays a major role in maintaining air quality.
- Shillong highlights the environmental benefits of preserving green cover in urban planning.
7.Perundurai, Tamil Nadu
- Located near Erode, Perundurai is a tiny town that retains its original design and growth pattern due to a well-developed planning regime.
- Consistently, air quality readings for many months fall within the (18-25) range, so that the community consistently receives good air quality scores (on a national scale) for their air quality (AQI).
- The primary factors contributing to the town’s low levels of PM₂.₅ throughout the year are minimal roadway traffic from cars or trucks, minimal industrial activity, and consistent/daily winds moving across hills and ridges.
8.Tirupur, Tamil Nadu
- Tirupur, India’s textile industry capital, has cleaner air than many larger industrial cities.
- In general, the average AQI ranges from 18 to 26, which is classified as ‘Good’ air quality. By implementing strict enforcement of environmental regulations and improving waste disposal and traffic flow, PM₂.₅ pollutants have been reduced.
9.Salem, Tamil Nadu
- The location of Salem allows air to flow freely year-round, thanks to its proximity to both mountain ranges and flatland areas.
- Typically, Salem reports AQI values of 18 to 26, indicating the city’s air quality is in good condition relative to environmental standards. These readings correspond to PM₂.₅ levels below levels considered hazardous.
- The combination of low-volume traffic, plentiful greenery, and geography provides additional resources to minimise pollution levels.
10.Davanagere, Karnataka
Davanagere is a growing city in central Karnataka with fewer pollution-intensive industries than larger metros.
- Air-quality data shows AQI levels typically between 22 and 30, still within the ‘Good’ range.
- Lower congestion, open surroundings, and steady wind patterns help maintain healthy PM₂.₅ levels.
Why Should You Care?
While these cities enjoy relatively cleaner air, none of them meet WHO’s recommended air quality standards. This means that even the best air in India isn’t truly “clean” by global benchmarks. Here’s why this matters:
- Health Impact: Poor air quality can lead to respiratory diseases, cardiovascular issues, and reduced life expectancy. Monitoring and improving air quality is crucial.
- Travel & Relocation: If you’re considering moving or planning a trip, knowing which cities have the cleanest air can help you make an informed decision.
- Policy Influence: Understanding which factors contribute to clean air can help push for better environmental policies in heavily polluted regions.
Conclusion
Based on CPCB pollution data, the cities listed above rank among India’s least polluted in 2025. Cities such as Ariyalur, Ooty, Shillong, and others consistently record ‘Good’ air quality levels during monitoring periods. Consistent and widespread air quality monitoring is essential for accurately assessing pollution levels and understanding long-term environmental trends in Indian cities. By monitoring air quality data with Oizom devices, which monitor various environmental parameters like air quality, pollutants, odorous and toxic gases, noise, weather conditions, radiation, etc., using our patented e-breathing technology, Oizom assures the highest accuracy even in extreme environmental conditions. I hope you find these insights helpful and interesting!
FAQs
The Air Quality Index (AQI) is commonly used to quantify air pollution. This considers contaminants such as NO₂, SO₂, CO, O₃, PM2.5, and PM10. To keep tabs on pollution levels, both public and private entities use sensors and air quality monitoring stations.
Heavy traffic, industrial emissions, building dust, and population density all contribute to the high levels of pollution found in major Indian cities like Delhi, Mumbai, and Kolkata. Winter fog is one example of a weather condition that can trap pollutants and deteriorate the quality of the air.
You can check real-time air pollution data on websites and apps like:
- Central Pollution Control Board (CPCB) AQI Dashboard
- SAFAR (System of Air Quality and Weather Forecasting and Research)
- World Air Quality Index (waqi.info)
- AirVisual App
