MANDATE & CONSTITUTIONAL SPECIFICATION

VAAYU Lite: runnable prototype

National Capital Region Atmospheric & Air Quality Diagnostic Interface

Problem Statement

Atmospheric particulate dispersion and severe winter pollution episodes across the National Capital Region demand rigorous, verifiable ground-truth sensor pipelines combined with vertical boundary layer thermodynamics. VAAYU Lite bridges automated continuous ambient air quality monitoring (CAAQMS) with physical sounding diagnostic models, enforcing strict data completeness validation before forecasting severe air quality excursions.

System Capability Matrix: Built vs Planned Architecture Roadmap

Built Components (Current Prototype)	Planned Features (Roadmap)
AQI engine with tests CPCB National Air Quality Index piecewise linear sub-index interpolation engine verified against 45 self-test regression vectors.	P(Severe) 72-hour forecast Probabilistic logistic regression models forecasting severe air quality excursions at 24h, 48h, and 72h lead horizons.
Station explorer on 2025-26 data OpenAQ / CPCB telemetry for Anand Vihar, Indirapuram, and Sector 11 Faridabad with strict 16h / 24h completeness guard.	Coupled WRF-Chem tier Regional micro-meteorological chemical transport model simulation coupled with diurnal boundary layer physics.
Inversion diagnostic on synthetic profiles Vertical temperature sounding analysis detecting surface-based radiation and elevated capping inversions with dynamic scaling.	Geostationary fire reconstruction Continuous INSAT-3D / Himawari diurnal agricultural biomass burning fire emission assimilation.
Fire-timing chart Satellite overpass active fire detection statistics.
Automated test harness Full test harness ensuring zero mock figures and strict data integrity.	Real Safdarjung profiles & fire-timing chart IMD operational radiosonde telemetry integration and MODIS / VIIRS active fire timing analysis.

CAAQMS NODES

Delhi, Ghaziabad, Faridabad

COMPLETENESS GUARD

16 / 24h

Diurnal 4 PM–4 PM IST Rule

DATA PROVENANCE

OpenAQ, CPCB

Official Telemetry Feeds

INTEGRITY REGIME

CPCB-2014 NAQI

Verified Breakpoints

CAAQMS OBSERVATIONAL NETWORK

Station Explorer

Continuous Ambient Air Quality Monitoring Station (CAAQMS) records, 24-hour 4 PM–4 PM IST daily AQI series, and sensor completeness audits.

2025-26 winter, PM-based AQI

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Location ID: — | City: — | Coordinates: —

BAM-1020 Beta Attenuation (PM2.5 / PM10)

Good (0–50) 0

Satisfactory (51–100) 0

Moderate (101–200) 0

Poor (201–300) 0

Very Poor (301–400) 0

Severe (>400) 0

Total Valid Days (≥16h/24h) 0 / 0

Daily AQI Timeline: 2025-26 winter, PM-based AQI

24-hour diurnal cycle (16:00 to 16:00 IST) • Null days shown as gaps per completeness guard (≥16h)

Good

Satisfactory

Moderate

Poor

Very Poor

Severe

Missing / Gap

Monthly Sensor QA/QC Completeness Audit STRICT PROTOCOL ENFORCEMENT

Tabulation of valid hourly observation vectors and diurnal completeness criteria across the winter season (≥16 valid hours required for daily AQI calculation).

Month	Hours Possible	Valid PM2.5 Hours	Valid PM10 Hours	PM2.5 Coverage %	PM10 Coverage %	Days Passing Completeness (≥16h)

CPCB 2014 SUB-INDEX CALCULATOR & PIECEWISE LINEAR ENGINE

AQI Calculator

Piecewise linear sub-index interpolation engine conforming to CPCB National Air Quality Index standards with real-time unit self-test verification.

Pollutant Concentration Vector (24-H Mean) TIER 1 INPUT

PM2.5 Concentration (24-h average, µg/m³)

CPCB Breakpoint Range: 0.0 – 500.0 µg/m³

PM10 Concentration (24-h average, µg/m³)

CPCB Breakpoint Range: 0.0 – 500.0 µg/m³

Governing Piecewise Linear Formulation

I = I_low + [ (I_high - I_low) / (C_high - C_low) ] × (C - C_low)
AQI = max(I_PM2.5, I_PM10)
Banker's rounding (round-half-to-even) applied per regulatory numerical specifications.

COMPUTED AIR QUALITY INDEX

— / 500 NAQI scale

Awaiting Input

Critical Responsible Pollutant: None

SUB-INDEX ANALYTICAL TRACE

Pollutant	Concentration	Interval [C_lo, C_hi] → [I_lo, I_hi]	Sub-Index	Category

CPCB Regulatory Self-Test Vectors Audit Automated Verification Suite

Runtime verification comparing calculated sub-indices and categories against official test cases embedded in data.json.

Test #	Description	Input Vector	Expected AQI	Computed AQI	Status

BOUNDARY LAYER METEOROLOGY & RADIOSONDE DIAGNOSTICS

Inversion Viewer

Vertical temperature-height sounding profile diagnostic engine identifying nocturnal surface-based and elevated thermal trapping layers.

synthetic example

Vertical Sounding: Temperature vs. Altitude

dT/dz > 0 indicates thermodynamic inversion trapping layer

Sounding Profile

Dry Adiabatic (Γd)

Trapping Layer

Inversion Diagnostic Dossier synthetic example

INVERSION TYPE

—

INVERSION STRENGTH (ΔT)

—

INVERSION BASE

—

INVERSION TOP

—

LAYER DEPTH (Δz)

—

Atmospheric Stability Advisory

Vertical Sounding Discrete Levels (synthetic example) Thermodynamic State

Altitude (m AGL)	Temperature (°C)	Lapse Rate (dT/dz)	Thermodynamic State