Delhi recorded its lowest pollution levels since October last year on Tuesday.<br />''<br />''Authorities said, heavy rain and fast winds in the city washed away the pollutants and cleansed the air, bringing the air quality in the satisfactory category.<br />''<br />''According to the Central Pollution Control Board data, the overall air quality index (AQI) in the national capital was 98, which falls in the satisfactory category.<br />''<br />''An AQI below 100 is considered satisfactory, between 100 and 200 is moderate, 201 and 300 poor, 301 and 400 very poor, and between 401 and 500 is considered severe.<br />''<br />''<span style="color: #222222;">Delhi has been battling hazardous pollution levels for the past few months and for the last one month the air quality has been oscillating between very poor and severe categories.</span><br />