Delhi breathed easier on Wednesday as the air quality improved to the ‘moderate’ category for the first time in 50 days, according to the Central Pollution Control Board (CPCB). The respite, however, might be short-lived, with forecasts predicting a return to ‘poor’ air quality by Friday.
Significant Improvement Recorded
The city’s 24-hour average Air Quality Index (AQI) stood at 178 by 4 PM on Wednesday, showing a significant improvement from 268 on Tuesday. This marks a welcome change, as the AQI had largely remained in the ‘poor’ to ‘very poor’ categories in recent weeks. The last time the AQI was ‘moderate’ was on October 15, with a reading of 198.
The improvement was attributed to strong surface winds sweeping across the region, as reported by an official from the India Meteorological Department (IMD). These winds are expected to persist through December 7, aiding in the dispersal of pollutants.
Air Quality Monitoring and Forecast
Of the 38 air quality monitoring stations in Delhi, most reported ‘moderate’ air quality on Wednesday. However, Sri Aurobindo Marg recorded ‘very poor’ air quality, while eight other stations reported ‘poor’ levels.
The Air Quality Early Warning System for Delhi predicted that air quality would remain ‘moderate’ until Thursday but could deteriorate to ‘poor’ on Friday and Saturday due to reduced wind activity and the onset of a western disturbance.
Weather Conditions
The improved air quality was accompanied by warmer-than-usual daytime temperatures. The maximum temperature in Delhi was recorded at 28°C, three degrees above the normal for this time of year. The minimum temperature was 12.5°C, 2.5 degrees higher than the seasonal average. Humidity levels ranged between 44% and 66% throughout the day.
Moderate fog is also expected from December 8 as the western disturbance brings changes to weather patterns.
Air Quality Index Categories
The CPCB classifies AQI levels as follows:
- Good (0-50): Minimal or no health impact
- Satisfactory (51-100): Minor health concern for sensitive individuals
- Moderate (101-200): Potential health impacts for sensitive groups
- Poor (201-300): Likely health effects on sensitive groups; general public may experience discomfort
- Very Poor (301-400): Health warnings for sensitive individuals; increased discomfort for the general public
- Severe (401+): Serious health risks for all
Outlook
While the current improvement provides a brief reprieve, Delhi residents are urged to prepare for worsening air quality over the weekend. Authorities continue to monitor the situation closely and advise taking precautions, particularly for those sensitive to air pollution.
Sources By Agencies