Kolkata, with a population of 4.497 million, clocked air quality at 347 this morning whereas the air quality in Orange is at 371.

Despite this, the air quality is an improvement on yesterday, but local residents are encouraged not to get lax.

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NSW Health authority said some groups of people are more sensitive to the air quality outside; including people with lung or heart disease, children, older adults and pregnant women.

The best steps for decreasing risk of bushfire smoke are; follow your doctor's advice, monitor air quality levels, avoid vigorous outdoor activity, spend more time indoors, spend time in air conditioned venues and avoid indoor sources of air pollution like cigarettes, candles and incense sticks.