Report · 25 July 2026

Delhi's average PM2.5 today is 29.4 µg/m³ and PM10 is 70.2 µg/m³. 42 of 46 stations breached the WHO limit for PM2.5; 38 of 42 breached it for PM10. Gas monitoring was down on this date, so this edition reports the two particulate pollutants directly, in micrograms per cubic metre, and publishes no composite index figure. Today's reading itself is weather-flattered by about 16 points.

143

AQI at the worst station

Wazirpur, Moderate

Analysis window: 10 AM 24th July to 10 AM 25th July
Baseline: YoY baseline: avg of 18th Jul - 1st Aug 2025 (same +/-7 days), matched stations

Today's full report

Roughly twelve pages: the verdict on today's air, every monitoring station, the weather versus policy attribution, the full year of de-weathered trends, and the annexures behind each number.

Download the daily reportPDF, 0.4 MB

The evidence

The daily residual: this year minus last year

■ Red: the de-weathered residual, weather removed. Above the zero line, pollution was higher than last year; below the zero line, it was lower.

Each point is a residual: that day's PM10 level minus the same period last year, after the model removes the effect of weather. The shaded band is the uncertainty around each day. Above the zero line means Delhi's air was genuinely worse than last year, and not merely unluckier with the wind; below it means genuinely cleaner. The run begins 30 May 2026.

The findings

What today's report says

Against the world standard

Even after removing the weather's help, Delhi's fine-particle level (PM2.5) is 36 micrograms per cubic metre (µg/m³), which is 2.4× the WHO safe limit of 15. The worst weather-corrected hotspot is Wazirpur at 50 µg/m³, which is 3.3× the WHO limit.

How widespread

After weather correction, 35 of 35 comparable stations are worse than last year. This is a city-wide rise, not a few bad spots.

Honesty box

On days it has never seen, the weather-correction model explains about 38% of the variation, so we treat its outputs as estimates, not exact points. The weather-corrected year-on-year change for fine particles is measured to within roughly ±1 percentage points of sampling error, before model uncertainty. Percentages compare the same stations in both years; single-day observed spikes are never used as the headline.

PM2.5

Weather-corrected claims allowed (model skill adequate) · PM10: weather-corrected claims allowed (model skill adequate)

Above the world standard today

PM2.5: 37 of 40 stations above the WHO daily limit as observed; even after weather correction, 40 of 40 remain above it. PM10: 38 of 42 stations above the WHO daily limit as observed; even after weather correction, 42 of 42 remain above it. (Weather-model matched panel.)

A caution we publish daily

Gas monitoring was down on this date: NO2 reported from 10 stations, SO2 reported from 9 stations, CO reported from 11 stations, against about 46 for PM. That is too thin to carry a reliable finding, so this edition reports PM2.5 and PM10 only, directly in micrograms per cubic metre. No composite AQI figure is published today.