Loading the owned archive and shared-hour comparison…
Campus comparison · owned archive
Compare two to five campus-linked reference monitors over the same archived hours. Current readings remain visible, while the historical ranking uses only PM2.5 hours shared by every selected reference monitor.
Official archive-first current layer · The page renders from Delhi Air Health's hourly CPCB-linked archive first, so a slow upstream API cannot hold the interface open. Source timestamp and monitor provenance stay attached to every value.
Owned archive · campus comparison
Ranking uses only archived hours where every selected campus reference monitor has a PM2.5 value. That keeps missing data from quietly giving one campus an easier comparison window.
Selected 2 of 5
The URL updates as you change this comparison.
Archive boundary
Archive began 6 Sept 2026, 4:00 pm. The requested 7-day period extends earlier than the dataset, so the chart and coverage denominators begin at the first archived hour instead of counting pre-archive time as missing.
Shared-hour ranking
65
common PM2.5 hours out of 76 archive-eligible hours in this view
1. SGTB Khalsa
72.8 µg/m³
2. Dr BSA
101.6 µg/m³
Lower here means a lower average PM2.5 at the linked reference monitor across the exact same archived hours. It is not a long-term health ranking of the campuses.
Threshold context
Dr BSA
8%
of 65 archived PM2.5 hours ≤ 60 µg/m³
SGTB Khalsa
22%
of 65 archived PM2.5 hours ≤ 60 µg/m³
These are concentration thresholds for exploring the archive, not official AQI categories and not exposure limits.
Side-by-side history
Rohini
Dr Baba Saheb Ambedkar Medical College
Current PM2.5
75 µg/m³
Average
101.6 µg/m³
Median
98 µg/m³
Lowest
58 µg/m³
6 Sept, 5:30 pm
Highest
150 µg/m³
8 Sept, 1:30 am
Data coverage
65/76 eligible h · 86%
Denominator starts at this monitor's first archived observation in the selected archive window; later missing hours stay missing.
Reference monitor
Rohini, Delhi - DPCC
2.1 km from campus · DPCC
North Campus
Sri Guru Tegh Bahadur Khalsa College
Current PM2.5
62 µg/m³
Average
72.8 µg/m³
Median
74 µg/m³
Lowest
36 µg/m³
6 Sept, 7:30 pm
Highest
116 µg/m³
8 Sept, 12:30 am
Data coverage
65/76 eligible h · 86%
Denominator starts at this monitor's first archived observation in the selected archive window; later missing hours stay missing.
Reference monitor
Ashok Vihar, Delhi - DPCC
2.7 km from campus · DPCC
Interpretation boundary
This compares the nearby monitoring stations associated with each campus, not personal exposure and not air inside classrooms, hostels or hospitals. Campuses that share one physical reference monitor are explicitly marked; duplicated station data are not evidence of an independent campus difference. Pre-archive time is never coded as missing. Coverage is computed only over archive-eligible hours, and the ranking uses only PM2.5 hours shared by every selected reference monitor.