Pollution board wants new smog alert system

NEWDELHI: The country’s top pollution-monitoring body wants a smog alert system in place for Delhi, where air quality has just begun to improve after almost two weeks of toxic haze.

The central pollution control board (CPCB) wants the Indian meteorological department (IMD) to warn Delhi in advance about the dust storms in west Asia and also cyclones brewing in the Bay of Bengal, both of which have a bearing on Delhi’s air. “We have requested the IMD to develop an early warning system. If we get some prior intimation of what’s coming in from across the borders, we can take necessary precautions,” CPCB’s member secretary A Sudhakar told HT on Sunday.

Delhi’s recent smog nightmare was triggered, in large parts, by dust storms in Kuwait, Iraq and Saudi Arabia and not so much by stubble burning in neighbouring Punjab and Haryana, as was thought earlier.

Moisture-laden winds, pushed by the cyclones in the Bay of Bengal, were the other culprits. Moisture traps tiny airborne dust particles and hamper their dispersal, forming a heavy layer of pollutants.

Delhi’s Air Quality Index (AQI), a measure of particulate matter in the air, hit 486 and the levels stayed in severe category for seven days, forcing closure of schools, ban on entry of trucks and construction activity.

According to officials, the dust from the Gulf storms takes at least three to four days to hit Delhi. An early warning system will give authorities the headroom to minimise the impact of foul air.

For instance, the government can boost transport system before rolling out the road-rationing plan, which couldn’t take off this time, to minimise vehicular emissions.

The CPCB didn’t have a system to monitor the dust storms or tropical cyclones and their impact on Delhi, said D Saha, who head the pollution authority’s air quality laboratory.