From the India Today Archives (2023) | Delhi pollution: What lies in the air

Air pollution occurs when toxic materials enter the environment. In Delhi-NCR, the air contains concentrated carbon monoxide, nitrogen oxide, sulfur dioxide and hydrocarbons. These pollutants come from vehicles, factories and fossil-fuel burning. Sunlight can make them react and produce smog, a thick haze.

The mixture also contains particulate matter, or PM. It may include chemicals, soil, smoke, dust and allergens. PM is classified by particle diameter. Unlike some gases, the tiniest particles can travel deep into the lungs. The article identifies PM2.5 as especially dangerous because it is invisible and penetrates lung tissue.

Delhi-NCR’s pollution is not merely unpleasant or seasonal. The article reports dangerously high PM2.5 levels and links prolonged exposure with respiratory disease, cancer, diabetes and heart problems. Immediate effects include sore throats, coughs, watery eyes and chest tightness.

The article presents Delhi-NCR’s pollution as an extreme public-health problem. It says current pollution levels, especially fine particulate matter, could reduce the average Indian’s life by 5.3 years. For people living in Delhi, the estimated loss rises to 11.9 years. Delhi is described as the most polluted city in the country.

The article also says PM2.5 levels are dangerously high in Delhi NCR. Poor air quality produces immediate symptoms, while prolonged exposure raises risks involving the lungs, heart, brain, kidneys and metabolism. The comparison with other health risks is striking: cardiovascular disease reduces average Indian life expectancy by about 4.5 years.

The supplied text does not list AQI readings or compare Delhi’s levels with Mumbai, Kolkata, Bengaluru or other major Indian cities. It therefore supports Delhi’s national severity, but not a city-by-city AQI ranking.

Short-term exposure often causes allergy-like symptoms. People may develop a sore throat, cough, cold, watery eyes or tightness in the chest. Pollutants can irritate the eyes and harm the lungs. These visible symptoms are only the immediate part of the problem. The article describes longer-term damage as more insidious because it may remain invisible.

Swapan, a 58-year-old retired marketing professional, felt unable to breathe while walking outdoors. His throat was dry and chest tight. A doctor diagnosed early-stage COPD, a group of diseases involving airflow blockage and breathing problems. The article identifies pollution as the culprit in his case.

Research cited in the article links prolonged exposure with respiratory diseases, cancer, diabetes and heart problems. Pollutants can trigger an inflammatory cascade affecting the brain, kidneys and heart. The reported life expectancy losses show that polluted air can influence health over many years.

The article describes a recurring pre-winter phenomenon that covers the National Capital Region in a poisonous haze. It has become an annual event. During this period, pollution becomes highly visible as a thick, dystopian pall, while its deeper health effects remain less obvious. The article does not provide one single cause.

Instead, it lists several contributing factors. Delhi’s landlocked geography, crop burning, vehicular emissions and construction dust are all blamed. The pollutants include gases and particulate matter. Sunlight can help produce smog when pollutants react, adding to the haze described in the article.

The result is dangerous exposure for residents. Immediate problems include throat irritation, cough, watery eyes and chest tightness. Longer exposure can affect respiratory health and other organs. The article reports that living in Delhi may cost residents 11.9 years of life. It does not explain the seasonal mechanism in greater detail.

Delhi-NCR’s pollution comes from several sources rather than one actor. Vehicles release emissions, while factories and fossil-fuel burning add gases and particles. The article also names crop burning and construction dust as major contributors to the region’s annual haze. Delhi’s landlocked geography is another factor blamed for the problem.

The pollutants include carbon monoxide, nitrogen oxide, sulfur dioxide and hydrocarbons. They can react with sunlight to produce smog. Burning gasoline, oil, diesel fuel or wood produces much of the PM2.5 pollution. Construction activity contributes dust, which is part of the particulate mix. Crop burning adds another source of pollution.

The article says proposed responses include regulating traffic, restricting construction, offering farmers incentives not to burn stubble, cloud seeding and smog towers. Yet the haze returns each year. The source text does not quantify the exact share contributed by vehicles, farms, construction or industry.

PM means particulate matter, a mixture that can include chemicals, soil, smoke, dust and allergens. PM2.5 and PM10 are classified by particle diameter. PM2.5 consists of especially tiny particles. The article says one is 30 times thinner than a human hair, making it invisible to the naked eye.

That small size matters because PM2.5 can penetrate the lungs. Much PM2.5 pollution comes from burning gasoline, oil, diesel fuel or wood. PM10 is also harmful when its level exceeds the safe limit. These particles differ in size, shape and chemical composition, but both belong to the particulate pollution that concerns air-quality regulators.

Some gases mainly irritate the eyes and harm the lungs, especially in vulnerable groups. PM can affect even healthy individuals, according to the article. Delhi-NCR has dangerously high PM2.5 levels. This makes particulate exposure a wider public-health threat, not only a problem for people with existing breathing conditions.

The article says polluted air can trigger an inflammatory cascade. Inflammation is the body’s response to harmful irritation. Here, that response begins after people inhale polluted air, but its consequences may extend beyond the respiratory system. This explains why pollution is presented as a whole-body threat rather than only a lung problem.

Dr Vivek Nangia says pollutants can impact the brain, kidneys and heart, and can even cause diabetes. The article does not describe every biological step between inhalation and those outcomes. It does establish the central mechanism: pollution triggers inflammation, and that inflammatory cascade can affect multiple organs.

This matters because the first signs may seem minor or allergy-like. A sore throat, cough, watery eyes or chest tightness can hide longer-term risks. The article links prolonged exposure with respiratory diseases, cancer, diabetes and heart problems. It also reports major estimated life-expectancy losses, especially for Delhi residents.