Environmental Science.
Heat, air quality and altitude as measurable performance and safety variables.
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Heat, air quality, and altitude are performance variables long before they are political ones. They are also measurable, which is why they belong in the same conversation as training load.
What this field actually measures
- Wet bulb globe temperature
Heat stress index combining temperature, humidity, radiation, and wind.
ReferenceGoverning bodies use WBGT thresholds to modify or cancel play.
LimitAir temperature alone badly underestimates heat risk in humid conditions.
- Air quality index (PM2.5)
Fine particulate concentration in the air.
ReferenceElevated PM2.5 measurably reduces endurance performance and raises respiratory risk.
- Altitude
Elevation above sea level and the resulting oxygen availability.
ReferenceAerobic performance declines measurably above roughly 1,500 m without acclimatisation.
Evidence & metrics
The published work behind the numbers above, and the public datasets you can open to check us. If a claim can’t be traced here, we don’t print it.
Citations
IPCC Sixth Assessment Report, Working Group I
Intergovernmental Panel on Climate Change · 2021
States observed warming and attribution with explicit confidence language and uncertainty ranges.
Global surface temperature analysis (GISTEMP)
NASA Goddard Institute for Space Studies · ongoing
Provides the long-run instrumental temperature record with published methodology and error bounds.
Datasets
US National Oceanic and Atmospheric Administration · free
Station-level temperature, precipitation, and extremes back to the 19th century.
US Environmental Protection Agency · free
Monitor-level pollutant concentrations across the United States.
Still open
- What heat thresholds should be mandatory rather than advisory?
- How should air-quality cancellation policy be standardised across leagues?
- What is the cumulative cost of playing seasons in shifting climate conditions?
What we won’t say
We will not describe a heat-affected performance as a conditioning failure without the WBGT reading.
- VO-1Evidence before wit
- VO-2Punch at claims, never at people
- VO-3Say the uncertainty out loud
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