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 Address to refer: https://www.researchchannel.co.za/article/peru-relaxes-air-quality-standards-to-help-mining-industry-2017-06-07
 Article Headline: Peru relaxes air quality standards to help mining industry
 Abstract: Peru adopted new and more flexible air quality standards on Wednesday after the old standards were criticised by mining companies and President Pedro Pablo Kuczynski. A decree published by the environment ministry raised the maximum amount of sulphur dioxide, a byproduct of smelting copper and other base metals, that can be emitted to 250 micrograms per cubic metre per 24 hours, from the 20 micrograms per cubic metre previously.
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