On May 31, the US EPA published a technical correction affecting the MRL regulation for azoxystrobin.

On May 29, the US EPA published a final rule in the US Federal Register revoking tolerances for the active ingredient difenzoquat.

On April 24, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient azoxystrobin.

On May 15, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient spirotetramat.

On May 17, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient streptomycin.

Effective May 15, Japan's Ministry of Health, Labor and Welfare (MHLW amended Japan's MRL regulation (link in Japanese .

On May 17, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient sulfoxaflor.

Effective May 22, 2013, Health Canada’s Pest Management Regulatory Agency (PMRA established MRLs for the active ingredient clopyralid.

June 5, 2013, the European Union’s MRL amendment Commission Regulation (EU No 500/2013 entered into force.

On July 2, 2013, Food Standards Australia New Zealand (FSANZ published changes to Standard 1.4.2, Australia’s maximum residue limit regulation.