Asia's factory activity slumped in August as China's zero Covid curbs and cost pressures continued to hurt businesses, surveys showed today, darkening the outlook for the region's fragile recovery.

Manufacturing activity was weak in countries ranging from Japan, China, South Korea to Taiwan.

This was a sign that sluggish demand was adding to headaches for companies already suffering from lingering supply constraints.

The US Federal Reserve's resolve to continue aggressive interest rate hikes is also dampening the business mood by stoking fears of recession in one of Asia's biggest export markets, analysts say.

"China's pandemic curbs and geo-political tensions with the United States continue to disrupt supply chains. Rising inflation is also hurting domestic demand across Asia," said Toru Nishihama, chief economist at Dai-ichi Life Research Institute in Tokyo.

"Fears of US recession also are not helping. US and Chinese economies are engines of global growth so when both of them are wobbling, that spells trouble for businesses," the economist said.

There was, however, some relief for factories struggling with surging costs with input prices falling in China and Taiwan for the first time since May 2020 and increases generally slowing elsewhere.

China's private Caixin manufacturing purchasing managers' index (PMI) contracted for the first time in three months in August, data showed today, as soft demand, power shortages and fresh COVID-19 flare-ups disrupting production.

The unexpectedly weak reading echoed China's official PMI released yesterday, which was also below the 50-point mark that separates growth from contraction on a monthly basis.

Export powerhouses were equally weak. Japan's factory activity grew at its slowest rate in nearly a year in August, while that of South Korea shrank by the sharpest pace in two years, PMIs for both countries showed.

Manufacturing activity also deteriorated sharply in Taiwan, with production and new orders both falling at the quickest pace since the initial wave of the pandemic in May 2020.

"The marked deterioration in demand also meant that firms cut back on buying activity and inventories, as more firms anticipate production levels to decline further over the coming year," Annabel Fiddes, economics associate director at S&P Global, said on Taiwan's output outlook.

The final au Jibun Bank Japan Manufacturing Purchasing Managers' Index (PMI) fell to 51.5 in August from 52.1 in the prior month, marking the weakest growth rate since September 2021.

South Korea's PMI fell to 47.6 in August from 49.8 in July, remaining below the 50-threshold for a second month and hitting the lowest since July 2020.

Meanwhile, Taiwan's PMI hit 42.7 in August, down from 44.6 in July.

Weakening demand, however, is having the side-effect of easing price pressures. South Korean manufacturers saw input prices rise in August by the slowest rate in 19 months.

The average input costs faced by Taiwanese goods producers fell for the first time since May 2020, as prices of some raw material like steel and oil have started to fall.

India's factory activity continued to grow robustly in August thanks in part to a boost to output from easing input cost inflation, the country's PMI showed.

Southeast Asia remained a bright spot in the region with manufacturing activity growth in Indonesia, the Philippines and Thailand accelerating, while Malaysia's growth slowed slightly, the PMIs showed.