Thick smoke from wildfires and a historic drought has enveloped the Brazilian Amazon, leading to poor air quality in the region. In Manaus, a city of 2 million, air quality ranked among the worst globally, resulting in the suspension of college classes and the cancellation of activities such as an international marathon. Amazonas state recorded over 2,700 fires in the first 11 days of October, the highest number for the month since monitoring began in 1998. The fires are primarily caused by human activities such as deforestation. The region is also experiencing low river levels and the deaths of endangered pink dolphins.

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