How the change works
- 01 / Public decision
Coordinated plan
- 02 / Physical change
Reduction of sources
- 03 / Possible outcome
Concentrations evaluated with the weather
To understand if an air plan works, it is necessary to distinguish between local emissions, regional transport and meteorology.
Research and local documents ↓What the evidence tells us
The studies on Beijing in 2013—2017 analyze local and regional measurements, correcting or modeling the effect of weather on the observed improvement.
Putting the choices into practice
Borders
The challengeCity sources only
The responseAlso pollution carried from the region
Weather
The challengeAny decrease credited to policy
The responseSeparate contributions
Oversight
The challengePhoto of the sky
The responseComparable measures
The diagram compares choices and conditions for putting them into practice. Measured outcomes and their limits are discussed in the evidence.
Research and local documents ↓Conditions and limits
A clear day does not measure the effectiveness of the policy. The observed decline and the contribution of interventions are different quantities.
Other possible benefits
More reliable comparisons between interventions and breathed air.
Research and local documents
- Local document and reported findingAnalysis of local and regional air quality measures in Beijing, 2013—2017 ↗
Research on the case, mechanism, or measures discussed in the sheet.
- Local document and reported findingDeweathered trends in Beijing air quality ↗
Research on the case, mechanism, or measures discussed in the sheet.
