Any occurrence of CVT within 28 days of receiving the Oxford-AstraZeneca vaccine is defined internationally as being a result of the injection, it said.
Amid the prevailing but weakening El Nino conditions, the IMD had earlier warned of extreme heat during the April-June period, coinciding with the seven-phase Lok Sabha elections.
While ambient air pollution is known to affect respiratory and cardiovascular diseases, its effect on neurodegenerative disorders has limited evidence.
