RIO DE JANEIRO, BRAZIL - Air quality has been gradually improving in Rio de Janeiro and its metropolitan region since the quarantine came into effect on March 17th. A survey conducted by the State Environment Institute (INEA) in April and May showed a reduction in the release of nitrogen dioxide (NO2) and carbon monoxide (CO) into the atmosphere.
At the air quality monitoring station located in the Santa Cruz Industrial District, in the west zone of the city, the results show a 91 percent reduction in NO2 emissions in May, if compared to the period before social isolation.
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