Air quality has been deteriorating across India amid falling temperatures and New Delhi recorded the worst air quality among Indian cities, followed by Kolkata, on January 27. Over the past months, the Air Quality Index (AQI) has fallen dangerously low in the northern regions of the country, especially in New Delhi, where air quality turned ‘severe’ again due to low wind speed and high moisture levels, India Meteorological Department (IMD) officials said.
Faced with rising air pollution in Delhi-National Capital Region (NCR), the Centre had introduced a new law through an ordinance that puts in place a powerful oversight body and provides for up to five years of jail term and Rs 1 crore fine for violators with immediate effect.
PM2.5 is the mixture of solid particulate matter and liquid droplets found in the air. Breathing such air can affect the heart and cause chronic cardiovascular problems.
AQI between 0 and 50 is considered “good”, 51–100 is “satisfactory”, 101–200 is “moderately polluted”, 201–300 is “poor”, 301–400 is “very poor” and 401–500 is considered “severe”. The categorization may vary depending on the monitoring agency.