https://www.wikiwand.com/en/Emerging_market
https://www.wikiwand.com/en/Frontier_markets
https://www.wikiwand.com/en/Jim_O'Neill,_Baron_O'Neill_of_Gatley#/Next_Eleven
https://www.wikiwand.com/en/Developed_market

P.S. Currently reading other repos xmarquez/democracyData#9

The Montreal Protocol and Kigali Amendment divide the world's countries into a few groups with different ODS/refrigerant phasedown responsibilities. I think this grouping would be a good fit for inclusion.

Going off this factsheet, I see the following 4 mutually-exclusive groups:

1. Non-article 5 countries
   a. Main group
   b. different baseline calculation: Belarus, the Russian Federation, Kazakhstan, Tajikistan, and Uzbekistan.
2. Article 5 countries
   a. Group 1: Most Article 5 countries.
   b. Group 2: Bahrain, India, Iran, Iraq, Kuwait, Oman, Pakistan, Qatar, Saudi Arabia, and the United Arab Emirates.

There is also a "high ambient temperature exemption" for the following countries: Algeria, Bahrain, Benin, Burkina Faso, Central African Republic, Chad, Cote d'Ivoire, Djibouti, Egypt, Eritrea, Gambia, Ghana, Guinea, Guinea-Bissau, Iran, Iraq, Jordan, Kuwait, Libya, Mali, Mauritania, Niger, Nigeria, Oman, Pakistan, Qatar, Saudi Arabia, Senegal, Sudan, Syria, Togo, Tunisia, Turkmenistan and United Arab Emirates. I think these are all Article 5 countries, but I'm not sure.

Unfortunately, I can't find a perfect reference for exactly which countries are in Article 5.

This page from Pakistan's National Ozone Unit has a list of Article 5 countries, and Wikipedia's page on the Montreal Protocol says "147 of the 196 Parties to the Montreal Protocol meet these criteria (they are referred to as Article 5 countries)" but I don't see a citation for those numbers.

The closest thing I can find is UNEP's Ozonaction Networks page which has a table of regional networks of Ozone Officers. When I copy the table out of a PDF and cleanup the multi-line countries I get 147 (in a gist here), so that matches. But I don't know if that's an acceptable source for this repo. I could also see a case for adding each of these regions as a group if it doesn't line up with another regional grouping in the repo, I didn't check that.

Hope this is helpful, happy to help in any other way if I can.

Request to add the LLDCs group :)

http://unohrlls.org/about-lldcs/
https://en.wikipedia.org/wiki/Landlocked_developing_countries

Botswana
Burkina Faso
Burundi
Central African Republic
Chad
Ethiopia
Lesotho
Malawi
Mali
Niger
Rwanda
South Sudan
Swaziland
Uganda
Zambia
Zimbabwe
Afghanistan
Bhutan
Kazakhstan
Kyrgyzstan
Laos
Mongolia
Nepal
Tajikistan
Turkmenistan
Uzbekistan
Armenia
Azerbaijan
Macedonia
Moldova
Bolivia
Paraguay

Just wondering for the M49 data from where you get the JSON file? Are you scraping the unstats website and generating the json or making it manually or do you have access to an updated file or feed?

Also wondering what is your update policy?

https://ec.europa.eu/eurostat/statistics-explained/index.php/Glossary:EU_enlargements

http://www.oecd.org/about/membersandpartners/list-oecd-member-countries.htm

cc @swillner