SAO PAULO - Fires in Brazil's Amazon rainforest have surged in September, already making it the worst month in more than a decade, government data showed on Monday, after a jump in deforestation during an election year.

National space research agency INPE reported 36,850 fire alerts in the region so far this month, a 120 per cent rise over the full month last year and the worst on record for any month since September 2010, when INPE issued 43,933 alerts.

With that, the total fire alerts so far in 2022 climbed to 82,872, surpassing the 75,090 recorded in all of 2021.

Fires in the Amazon tend to peak in August and September, considered the burning season in the region, when rains subside to let ranchers and farmers often set fire to deforested areas.

This month, however, they have already surpassed the average of 32,110 fires for September, according to INPE satellite data dating back to 1998.

Destruction of Brazil's rainforest often picks up in election years, when law enforcement typically ebbs and loggers race ahead with plans ahead of a possible shift in conservation policy.

"Fires are not a natural phenomenon in the Amazon rainforest. These burnings are related to human activities, often illegal, and degradation levels that make it more susceptible to fires," said Mariana Napolitano, WWF-Brasil's science manager.

Brazilians will vote on Oct 2 whether to give a second term to President Jair Bolsonaro, who has rolled back environmental protections, seeing deforestation in the Amazon surge to a 15-year high.

"Brazil was once a world reference in monitoring national forests, but unfortunately the responsible agencies have been dismantled by the government," former INPE director Ricardo Galvao, now running for Congress, said on Twitter.

Bolsonaro is trailing in opinion polls to former President Luiz Inacio Lula da Silva, who has vowed to bolster law enforcement in the Amazon to curb deforestation if elected.

Bolsonaro's office forwarded a request for comment to the Justice and Public Security Ministry, which did not immediately respond to it.

In August, fires had already been the highest for the month since 2010.

Data also showed that 1,661 square kilometers were cleared in the Amazon last month, an 81 per cent increase from the same period in 2021.

In a speech at the United Nations last week, Bolsonaro praised Brazil's renewable energy efforts and said most of the Amazon remains untouched, criticising the media for its reports on deforestation. REUTERS