The Centre has also called a meeting of state food and consumer affairs ministers to discuss measures to contain inflation, that rose to 6.01 per cent in May.
The meeting, to be chaired by Finance Minister Arun Jaitley, will discuss among other things implementation of the National Food Security Act.
As the prices continued to rise, the Prime Minister took stock of the situation and directed Consumer Affairs Secretary Keshav Desiraju to write to Chief Secretaries of all states to take corrective steps, official sources said.
"Needless to say, the rise in prices of onion has been a matter of great concern with the government. Several steps have been taken recently to bring under control the rise in prices of this essential item," he wrote.
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"The reported spurt in prices could considerably impact the budget of ordinary public. So, urgent measures at the state level are required to tackle the situation," said his letter to Chief Secretaries.
The Centre's step came as prices of essential commodities, particularly onion, increased. In the national capital, onions are retailing for Rs 25-30 a kg, while the wholesale price is about Rs 18 a kg.