Activity guide · cycling
Cycling and air quality: forecast timing, route variation, and limits
A city forecast can help compare departure periods for cycling, but it cannot calculate a rider’s route-integrated exposure. Route, traffic proximity, tunnels, terrain, duration, and model resolution remain explicit limitations.
Activity changes caution, not rank
Use the forecast for timing, not route simulation
AirAgora evaluates a selected city coordinate with the named OpenWeather 1–5 scale and complete two-hour windows. This supports a consistent comparison between broad periods. It does not sample every segment of a route or infer the conditions inside a bike lane, tunnel, or building.
Long rides can cross multiple model cells, administrative areas, and timezones. A single city result is most useful as a starting context rather than a door-to-door estimate.
Near-road and terrain differences are below the broad grid
OpenWeather provides modeled fields with documented resolution across a broad provider grid. Roadside gradients, junctions, tunnels, valleys, coastlines, and moving plumes can occur at much smaller scales.
AirAgora never converts a city coordinate into a claim about traffic emissions on a route. Its static pages use GeoNames facts and avoid unsupported local pollution-source narratives.
Duration makes the worst hour relevant
A ride may begin in one category and finish in another. The AirAgora score uses 70 percent of the mean normalized severity and 30 percent of the worst hour across each complete window. Missing hours remove the candidate.
If windows are effectively tied, the earlier one wins for stability. If the winner barely improves on the median, the interface says conditions are broadly similar instead of promoting a precise departure minute.
Activity context stays separate from environmental order
Selecting cycling raises the prominence of exertion-related caution but does not modify the ranked windows. The same forecast therefore has one explainable environmental order rather than a hidden formula per profile.
The product cannot assess an individual rider’s health, equipment, pace, route, or duration. Public activity guides and professional advice remain the appropriate sources for personal decisions.
Severe events and official information
During wildfire smoke, dust, or industrial incidents, local notices and monitor networks can provide more immediate route-specific context. A model can lag, smooth a plume, or use a different valid time.
When every practical window is elevated, AirAgora uses least-polluted language and never labels the top rank safe. The caution and official-guidance direction remain public, regardless of plan.
- Match the forecast window to the ride duration.
- Consider whether the route leaves the selected city cell.
- Check model time, index scheme, and stale state.
- Do not infer route sources from a main pollutant label.
- Prioritize official warnings in a severe event.
Direct answers
Frequently asked questions
Can AirAgora evaluate a GPX route?
No. The current product compares a selected city coordinate and does not produce route-integrated exposure.
Why can a bike lane differ from the forecast?
Road proximity, junctions, tunnels, terrain, and plumes occur below the broad model-grid resolution.
Does selecting cycling change the best period?
No. It changes caution language, while the deterministic environmental score remains the same.
Why include the worst hour?
A deterioration during a ride should not disappear inside a pure average. The fixed score gives it 30 percent weight.
Can the main pollutant prove traffic is the cause?
No. A component explains the aggregate index but does not establish a local source.
What happens during an all-poor forecast?
AirAgora can label the least polluted available period, preserves caution, and directs urgent decisions to official guidance.
Evidence register
Sources and further reading
The links below identify the primary references used on this page. Selection, summary, and presentation are AirAgora modifications.
Keep exploring
AirAgora provides informational planning guidance, not medical advice. Local conditions can differ from modeled forecasts; follow official guidance during severe events.