URBAN AIR QUALITY · CAMDEN, LONDON

Explore PM2.5 across Camden.

Change emissions and weather, run the trained surrogate, and inspect the predicted concentration and its change.

12 model heights15–195 m · 10 m horizontal gridLoading the reference domain

Set a scenario

Change physical inputs before the model’s original normalization.

PM2.5 emissions100%

Scale the emissions supplied to the surrogate.

0%200%

Incoming PM2.50 µg/m³

Offset the incoming concentration profile at every height. A negative concentration is rejected.

−5 µg/m³+5 µg/m³

Wind speed factor100%

Scale the horizontal wind forcing profile.

50%200%

Wind direction adjustment0°

Positive values rotate the horizontal forcing clockwise.

−180°+180°

Loading the model and reference case…

Exploratory scenarios

Controls describe what is changed in the surrogate inputs. Their ranges are demonstration settings. Changed scenarios require new PALM simulations for independent physical validation.

REFERENCE CASE

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Checking the prediction device…

Concentrations in µg/m³. Heights follow the model’s fixed vertical coordinate.

THE PREDICTED FIELD

Preparing the reference case

Model height

Loading the model and data…

Maps will appear when the reference calculation is ready.

Baseline mean—µg/m³

Scenario mean—µg/m³

Mean change—scenario − baseline · µg/m³

Average absolute change—µg/m³ · no sign cancellation

Baseline and scenario share one concentration scale; the difference has its own zero-centred scale.

Difference contrast

Baseline

Original inputs

N ↑

—Easting · BNG km—

—µg/m³—

Scenario

Same as baseline

N ↑

—Easting · BNG km—

—µg/m³—

Change

Scenario − baseline

N ↑

—Easting · BNG km—

—µg/m³—

Excluded atmospheric cells are hidden.Coordinates: British National Grid

Concentration colours clip to the combined 2nd–98th percentiles. Numeric inspection, metrics and CSV retain unclipped values.

Move over a map to inspect a cell.Click any map for vertical profiles at the same location.

Vertical profiles at a location

Click a valid atmospheric cell on a map.

Concentration · µg/m³

BaselineScenario

Change · µg/m³

Dashed line marks zero. Missing atmospheric levels remain blank.

Compare the two fields

Up to 4,000 evenly sampled valid cells at the selected height; metrics use all valid cells.

— cells

Reading the difference

Signed mean change can hide increases and decreases that cancel. Average absolute change shows their average size.

Results at all 12 heights

Select a row to view that height.

Metrics CSV ↓

Full fields and settings are saved on the computation server.

Selected-height CSV ↓

Model, data and interpretation

This comparison displays the supplied surrogate’s unchanged prediction and the matching hourly PALM simulation. Error is the surrogate prediction minus PALM.

Scenario controls modify model inputs in physical units. Previous atmospheric states and temporal features follow the supplied model workflow. Changing viewing height or selecting a location uses the already computed field.

All 12 supplied model heights are available. A level with no valid atmospheric cells is shown as empty. Concentration colours are clipped for visibility; errors and changes remain signed and all numeric metrics use the unmodified fields.

Recorded reference and model metadata

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