भारतीय शहरे हवेच्या प्रतवारीनुसार धोकादायक, वाईट, निकृष्ट, बरे व चांगले अशा वर्गवारीत विभागले गेले आहेत.
तर पुढील दोन विधानांपैकी कोणते योग्य आहे ?
(a) महाराष्ट्रातील कोणतेही शहर धोकादायक वर्गात मोडत नाही.
(b) तुतीकोरिन व कोईंबतूर चांगल्या वर्गात येतात.
पर्यायी उत्तरे :

The correct answer is Option C (Both).

Key Points:
• National Air Quality Index (AQI) & Urban Air Quality Assessment (CPCB):
• National Air Quality Framework: The Central Pollution Control Board (CPCB) and Ministry of Environment, Forest and Climate Change launched the National Air Quality Index (AQI) to classify urban ambient air quality based on pollutant concentrations (PM10, PM2.5, NO2, SO2, CO, O3, NH3, Pb) into categories: Good (चांगले), Satisfactory/Fair (बरे), Moderate/Poor (निकृष्ट), Poor/Bad (वाईट), Very Poor, and Severe/Dangerous (धोकादायक).
• Maharashtra Air Quality Status: Statement (a) is correct. During baseline evaluations and national rankings, extreme/severe ('Dangerous' AQI > 400) air pollution categories were predominantly concentrated in the northern Indo-Gangetic belt (Delhi, Gwalior, Kanpur, Patna, Raipur); no city in Maharashtra fell under the chronic 'Dangerous / Severe' threshold.
• Southern Coastal/Interior Cities: Statement (b) is correct. Cities in Tamil Nadu like Tuticorin (Thoothukudi) and Coimbatore recorded substantially lower particulate loadings and favorable maritime/geographic dispersion, placing them in the 'Good' (AQI 0–50) category.
• Therefore, Both statements (a) and (b) are correct (Option 3).
• Key Takeaway: No Maharashtra city fell in the Dangerous AQI category, while southern cities like Tuticorin and Coimbatore maintained Good AQI status.