As the national capital’s air quality continues to worsen with the latest Air Quality Index (AQI) between 400 and 500, meaning ‘severe,’ we take a look at some of the cleanest states in the country.As of 2025-11-14 01:05:00 PM (Local Time), the northeastern state reported an AQI of 98, with air quality ‘moderate.’Meghalaya Meghalaya live AQI (Photo: Website/aqi.in)As of 12025-11-14 01:17:11 PM (Local Time), the northeastern state reported AQI of 52, with air quality ‘moderate’Story continues below this adSikkim Sikkim live AQI (Photo: Website/aqi.in)As of 2025-11-14 01:18:10 PM (Local Time), the northeastern state reported AQI of 46, with air quality ‘good’Mizoram Mizoram live AQI (Photo: Website/ aqi.in)As of 2025-11-14 01:23:05 PM (Local Time), the northeastern state reported AQI of 53, with air quality ‘moderate’Tripura Tripura live AQI (Photo: Website/aqi.in)As of 2025-11-14 01:29:11 PM (Local Time), the northeastern state reported AQI 57, with air quality ‘moderate.’What makes the air in these states cleaner than the rest?The northeastern and Himalayan states, such as Arunachal Pradesh, Sikkim, Meghalaya, Mizoram, Tripura, and Himachal Pradesh, consistently record cleaner air compared to most urban centres in India. Several geographical and environmental factors contribute to their better Air Quality Index (AQI).Story continues below this adAccording to Dr Manas Mengar, Consultant Pulmonology at Thane’s KIMS Hospitals, “Some regions continue to bask in cleaner air because there, nature remains a powerful influence. Thick forests have become gigantic air purifiers, absorbing pollutants and releasing clean oxygen. The mountains ensure that there is natural airflow; hence, there is negligible settling of pollutants. Lower population density translates into fewer vehicles, minimal construction, and relatively scant industrial activity. With slow urban growth and abundant greenery, the air remains lighter, cleaner, and far less damaging. Everyday life in such places simply exposes the lungs to fewer irritants than in crowded, high-traffic metros.”ALSO READ | GRAP 4 in Delhi: Doctor explains how pollution from old vehicles affects healthWhat determines the air quality?According to the Central Pollution Control Board (CPCB), an AQI between 0 and 50 is considered ‘good,’ 51–100 ‘satisfactory,’ 101–200 ‘moderate,’ 201–300 ‘poor,’ 301–400 ‘very poor,’ and 401–500 ‘severe.’ With Delhi stuck in the last category, these cleaner states remind us that sustainable living, low emissions, and ecological preservation can still ensure fresh air—a luxury for millions in India’s urban centers.Here’s how breathing polluted air affects your lungsDr Mengar explained, “Breathing polluted air forces the lungs to work harder every single day. Tiny particles from traffic fumes, burning waste, dust, and industrial smoke irritate the airways, making breathing less efficient. Many people notice symptoms such as coughing, chest tightness, breathlessness, and burning eyes when pollution levels spike.”He added that smaller particles are the most harmful because they travel deep into the lungs and can even enter the bloodstream. This affects heart function, increases inflammation, and weakens overall immunity. “Children and older adults tend to experience these effects sooner, but even healthy individuals can develop reduced stamina, frequent throat infections, and long-term respiratory issues if exposure persists.”Ways to survive Delhi pollutionStory continues below this adSome simple habits can make everyday breathing easier during peak pollution, the doctor advised. Here’s what you need to do:– Wear a good N95 mask when stepping outdoors.– When smog is usually worst, Avoid early-morning and late-evening outdoor activities.– Keep doors and windows shut on high-pollution days.– Use an air purifier at home, especially where you sleep.– Drink plenty of water to help the body clear toxins.– Wash your face and rinse your eyes after coming home.– Add antioxidant-rich foods like oranges, amla, nuts, green leafy vegetables, and herbal teas to your routine.– Move workouts indoors when the air quality dips.– Track the AQI before planning travel.– Keep indoor plants that support cleaner air, such as snake plants and peace lilies.DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.