Can Green Crackers Make Diwali Cleaner? Understanding the Science Behind Their Promise

Green crackers are fireworks redesigned to reduce pollution while keeping familiar effects such as sparkle and sound. Scientists changed their chemical formulations, lowered the amounts of some ingredients, and improved combustion. They are not pollution-free, but they are intended to cause less environmental and health damage than conventional crackers.

For example, qualifying green crackers must reduce particulate matter emissions by at least 30%, or achieve a 20% reduction in particulate emissions plus at least 10% lower gaseous emissions. They also exclude certain harmful chemicals, including barium nitrate. Their formulations are designed to reduce ash and other emissions.

Green crackers were introduced in India in 2019. Their benefit depends on certification and how many are used. A product labelled “eco-friendly” or “pollution-free” is not automatically genuine, so buyers should seek authorised manufacturers with valid certification. Fewer crackers remain the strongest way to reduce pollution.

Certified green crackers have two recognised emission-reduction routes under NEERI’s criteria. One requires particulate matter emissions to fall by at least 30% compared with a conventional counterpart. The other requires at least 20% lower particulate emissions together with a minimum 10% reduction in gaseous emissions.

These gases include sulphur dioxide and nitrogen dioxide. The figures compare an individual green cracker with its conventional equivalent. They describe the product’s measured emissions, not a guaranteed percentage improvement in a whole neighbourhood or city. The reduction also does not mean the cracker produces no pollution.

The wider result depends on how many crackers people burst, weather conditions, and pollution from vehicles, industries, and other sources. Some green crackers may release higher numbers of ultrafine particles than conventional ones. Certification matters, so buyers should choose authorised manufacturers with valid certification rather than trusting vague packaging claims.

Large-scale bursting releases particulate matter, sulphur dioxide, nitrogen oxides and other gases into the air. When thousands of crackers are used within a few hours, their emissions add to pollution already produced by vehicles, industries and other sources. The result can be a smoky, chemically scented atmosphere that lasts beyond each brief explosion.

The particles can enter the respiratory system, with some travelling deep into the lungs and even entering the bloodstream. People may experience coughing, throat irritation, breathlessness and burning eyes. Loud bursts create a second problem: noise pollution that can distress infants, older people, pets and sound-sensitive individuals.

People with asthma, respiratory conditions or heart problems may see existing symptoms worsen. Children and older adults are especially vulnerable. Green crackers may reduce some emissions, but they do not remove pollution. Bursting fewer crackers and considering other celebrations can reduce the overall impact.

Green crackers were developed to address the pollution caused by conventional fireworks. The work involved scientists at the Council of Scientific and Industrial Research, or CSIR, along with the National Environmental Engineering Research Institute, or NEERI. They changed the chemical formulations and reduced certain raw materials.

The crackers were introduced in India in 2019. Their design aims to retain familiar fireworks features, including sparkle and sound, while releasing fewer pollutants. NEERI’s criteria recognise formulations that reduce particulate matter by at least 30%, or reduce particulates by at least 20% while also cutting gaseous emissions by at least 10%.

This development is a step toward reducing harm, not a declaration that fireworks are safe. Green crackers still release particles and gases, and some may produce more ultrafine particles than conventional versions. Their wider benefit depends on certification, use, weather and the total number burst.

SWAS, STAR and SAFAL are three recognised green-cracker categories. Each uses a different formulation strategy to lower pollution. The changes may involve adding a material, replacing an ingredient, reducing an ingredient, or making combustion more efficient.

SWAS, or Safe Water Releaser, releases water vapour during combustion. This helps suppress dust particles and reduce particulate emissions. STAR, or Safe Thermite Cracker, uses iron oxide-based formulations to improve combustion efficiency and reduce emissions. SAFAL, or Safe Minimal Aluminium, uses porous zeolite-based materials to help reduce the amount of aluminium required.

Green crackers also exclude certain harmful chemicals, including barium nitrate, and use modified formulations to reduce ash and other emissions. These changes can lower pollution, but they do not eliminate it. The crackers still release particulate matter and gases, and their effects depend on how many are used and whether products are properly certified.

A percentage reduction describes the difference between one green cracker and its conventional counterpart. It does not measure the entire pollution load over a city. If many crackers are burst, even reduced emissions can add up quickly. The starting pollution level also includes emissions from vehicles, industries and other sources.

For example, if each cracker releases fewer particles but thousands are burst within a few hours, their combined emissions may still create a heavy pollution cloud. Weather conditions can affect how pollutants spread or remain over streets. The article also notes that some green crackers may release higher numbers of ultrafine particles, so total mass alone does not describe every risk.

Therefore, a 30% reduction from an individual cracker cannot be translated directly into a 30% cleaner city. Green crackers are a step toward reducing damage, not permission to use unlimited quantities. Bursting fewer crackers can reduce the overall burden more effectively.

Particulate matter, or PM, is airborne material made of tiny solid particles or droplets. In standard air-pollution usage, PM10 is 10 micrometres or smaller, while PM2.5 is 2.5 micrometres or smaller. Ultrafine particles are smaller still, commonly defined as under 0.1 micrometre. These size labels describe how particles behave in the body.

The smaller a particle is, the farther it may travel through the respiratory system. The article explains that some firecracker particles can reach deep into the lungs and even enter the bloodstream. It also warns that some green crackers could release higher numbers of ultrafine particles than conventional ones, despite lower overall emissions.

This means total pollution mass is not the whole picture. A lower amount of emissions may still include particularly tiny particles. Green crackers can reduce some harm, but they remain a source of particles and gases. The size of those particles helps explain why exposure can affect health.