The NCR is a rapidly urbanising and polluted area around New Delhi that is one-third the size of New York state, but houses 2.5 times more people.
A win in Karnataka would be regarded as a major boost for the BJP and Prime Minister Narendra Modi ahead of general elections scheduled in 2019.
Both Narendra Modi and Congress leader Rahul Gandhi have campaigned hard in Karnataka, a state of 66 million people with diverse constituencies.
Indian Prime Minister Narendra Modi has thrown himself into a campaign to win a tight state election this weekend and secure a beachhead in the south, ahead of his own re-election bid next year.
The scheme, which the government dubs "Modicare", was announced in federal budget for 2018/19 and would provide 100 million families, or about 500 million poor people, with health cover of 500,000 rupees per year.
Tens of thousands of Indians voted in the first stage of assembly elections in the western state of Gujarat on Saturday, where Prime Minister Narendra Modi faces his toughest electoral test since coming to power with a landslide victory in 2014.
The comment came ahead of a vital test of popularity for Modi after a series of controversial economic reforms when Gujarat -- the state where he forged his political career -- goes to the polls on Saturday.
Prime Minister Narendra Modi said that India shared Myanmar's concern about "extremist violence" in its Rakhine state, where a security force operation against Muslim rebels has sent about 125,000 people fleeing to Bangladesh.
Chinese President Xi Jinping has told Indian Prime Minister Narendra Modi that their two countries should pursue "healthy, stable bilateral ties", state media reported on Tuesday in the wake of a protracted border standoff.