Columbia subject headings:
Air--Pollution--Law and legislation--Europe.
Air--Pollution--Law and legislation--North America.
Transboundary pollution--Law and legislation.
Volatile organic compounds--Law and legislation--Europe.
Volatile organic compounds--Law and legislation--North America.
Harvard subject headings:
Air quality management--International cooperation--Law and legislation.
Air--Pollution--Law and legislation--Europe.
Transboundary pollution--Law and legislation--Europe.
Princeton subject headings:
Air--Pollution--Law and legislation--Europe.
Air--Pollution--Law and legislation--North America.
Transboundary pollution--Law and legislation.
Volatile organic compounds--Law and legislation--Europe.
Volatile organic compounds--Law and legislation--North America.