The air quality of Delhi is swinging between ‘poor’ and ‘very poor’ category for past few days. The national capital is covered up to thick blanket of smog and dust on Wednesday. Sulfur Oxides, dust and soot are a growing threat to the health of lakhs of people residing in and around Delhi. According to the Centre-run System of Air Quality and Weather Forecasting and Research (SAFAR), the air quality is in ‘poor’ category. According to the latest AQI data, a major pollutant PM 2.5 is at 273 and PM 10 at 266 in Lodhi Road area.