Mumbai AQI 322: why a very-poor reading does not automatically close schools

What the readings actually showed

Reporting on the weekend put Mumbai's air quality index at 322, described as very poor, on Saturday 24 October 2026, with haze and complaints such as headache, sore throat and eye irritation reported among residents. The same reporting put Delhi at a moderate 176 on 24 October, described as its best reading for that date in ten years, after road sweeping, waste removal and water sprinkling.

The contrast is useful because it shows that a single national picture would mislead. Mumbai's reported drivers included construction dust, sluggish wind, garbage burning, emissions from crop fires in surrounding regions and residual firecracker smoke, while Delhi's improvement was attributed by officials to sustained civic measures. A city average also hides local variation, which is why station-level readings near a school or home matter more than one headline number.

Schools: what counts as an official closure

The key point for parents and schools is that a very-poor AQI does not, by itself, mean schools are shut in Mumbai. Guidance reported for Mumbai states that no closure happens without a formal civic or education order, and that families should verify a dated order on verified channels, including the Mumbai civic body's channels and government resolution pages, rather than acting on a WhatsApp forward without a date, signature or official seal.

Delhi's Graded Response Action Plan, which is often quoted in national coverage, applies to Delhi-NCR, not to Mumbai. Mumbai's reported approach instead relies on Central Pollution Control Board health advisories and specific civic orders, with the Sameer app and the board's afternoon city bulletin suggested as checks. Schools were advised in the reported guidance to prioritise trends at stations near the campus, and to move high-exertion outdoor activity indoors or postpone it when local readings are very poor.

The Bombay High Court was also reported as having taken note of the worsening situation and directed authorities to intensify enforcement against polluting activities. That is a direction to authorities, not a school-closure order by itself, and it should not be quoted as one.

Masks, outdoor activity and indoor air: general guidance only

On masks, the guidance reported for Mumbai distinguishes fitted respirators from cloth coverings: a well-fitted N95, KN95 or FFP2 respirator was described as filtering fine particles, while cloth masks, scarves and handkerchiefs were described as not filtering PM2.5 effectively. Fit around the nose and chin, and replacing a disposable mask when dirty or after heavy use as instructed, were presented as more important than branding.

For outdoor activity, the reported guidance was to postpone high-exertion outdoor exercise when air is very poor, shift physical education indoors, shorten sessions, and keep rest breaks, with particular caution for children, older people and people with existing breathing conditions. For indoor spaces, the guidance mentioned running a HEPA purifier, shutting leaky windows, using recirculation when outside air is worse, and ventilating briefly only when outdoor air improves. This article gives general information only and does not give personal medical advice for any individual; anyone with breathing difficulty or a care plan should follow their own school, clinician or official health advice.

Editorial disclosure

This article was researched and published with AI assistance. No human prepublication review is claimed. Report factual errors through our contact page.