Delhi govt to use dust suppressants to combat poor AQI: what are they and do they work?

Source: The post is based on the article “Delhi govt to use dust suppressants to combat poor AQI: what are they and do they work?” published in “Indian Express” on 25th October 2023

What is the News?

Dust suppressants are being used in Delhi to reduce pollution from dust.

What are Dust suppressants?

Dust suppressants are used to reduce pollution from dust.

They are typically salts of calcium or magnesium.They have the ability to absorb moisture.

In Delhi, dust suppressant powder would be mixed along with water and sprayed on roads to keep dust levels lower.

Are Dust suppressants effective in reducing pollution from dust?

CPCB Study: In 2019, Central Pollution Control Board (CPCB) had found that using dust suppressants along with water is more effective in controlling pollution compared to just spraying water.

– It conducted a study which showed a 30% reduction in dust concentration (PM10, PM2.5, and PM1) for up to six hours when dust suppressants were used on construction sites and roads.

Delhi PWD Advisory: In 2019, the Delhi Public Works Department (PWD) had issued an advisory supporting the use of dust suppressants.

– It said that using dust suppressants with bio-additives can reduce dust for five to six hours, compared to plain water sprinkling which is effective for only 15 to 30 minutes.