![AIR POLICY](/sites/default/files/styles/max_1300x1300/public/2022-02/Air%20%285%29.png?itok=M9pKlWiT)
1. Legal approach: Threshold limit value for a single gas (TLV)
![data](/sites/default/files/styles/large/public/2022-01/Capture%20d%E2%80%99%C3%A9cran%202022-01-21%20073015.png?itok=NT6XYbTa)
2 . Negotiation: pragmatically improving the limit values from year to year by regional negotiations
![data](/sites/default/files/styles/large/public/2022-01/image067.png?itok=2GX74AGp)
3. Mathematics: Limits for weighted mean values summing up the effect of various gases
![data](/sites/default/files/styles/large/public/2022-01/image068.png?itok=IswDBjxg)
4. International negotiations: Prescription of annual decrease by x% points of national emissions
![data](/sites/default/files/styles/large/public/2022-01/image069.png?itok=ICXwn_pj)
![overview map rounded](/sites/default/files/styles/max_650x650/public/2022-02/image.png?itok=rC7BvvXy)
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Sources:
- https://en.wikipedia.org/wiki/Threshold_limit_value
https://www.researchgate.net/publication/263707803_Gasoline_Risk_Management_A_Compendium_of_Regulations_Standards_and_Industry_Practices/figures?lo=1 - https://www.who.int/phe/delivering-air-quality.pdf
- https://www.eea.europa.eu/data-and-maps/figures/air-quality-standards-under-the-1
- https://www.eea.europa.eu/data-and-maps/indicators/greenhouse-gas-emission-trends-7/assessment