Delhi’s air improves briefly as AQI hits 102-day low; ‘poor’ air expected to return around Republic Day weekend
Delhi recorded its cleanest air in over three months after rain and gusty winds brought the AQI down to a ‘moderate’ level. Forecasts, however, suggest pollution levels may worsen again, with ‘poor’ and ‘very poor’ categories expected around January 25–27, alongside shifting winter weather conditions linked to western disturbances.
What changed in Delhi’s air
Delhi saw a sharp, short-term improvement in air quality after rain and winds helped disperse pollutants. On Saturday, January 24, 2026, the city’s AQI fell to 192—its lowest level in 102 days—marking the first ‘moderate’ reading since October 13.
The improvement followed widespread rainfall and gusty winds, though the day-average AQI on Friday still remained in the ‘poor’ category. Such brief dips are common in North India’s winter pollution cycle when weather conditions temporarily aid dispersion.
Why the relief may not last
Air-quality forecasting systems indicated that pollution could rebound quickly. The outlook suggested Delhi’s AQI may slip back to ‘poor’ on Sunday, January 25, and potentially worsen to ‘very poor’ around Republic Day (January 26), before fluctuating between ‘poor’ and ‘very poor’ in subsequent days.
Weather conditions remain a key driver. Cold nights, shallow to moderate fog, and changing wind patterns can trap pollutants near ground level, while incoming western disturbances can bring rain and gusts that briefly improve air but also shift temperature and humidity in ways that affect pollutant concentration.
Health relevance and practical caution
Even when AQI moves from ‘very poor’ to ‘moderate’, sensitive groups—including children, older adults, pregnant people, and those with asthma or heart conditions—may still experience symptoms. During expected ‘poor/very poor’ days, limiting strenuous outdoor activity and monitoring symptoms remains prudent.
With Republic Day gatherings and outdoor events around January 26, residents and visitors may need to factor in both cold stress and pollution exposure, especially during early morning hours when fog and low wind speeds can worsen near-surface air quality.