Every morning, tens of thousands of auto-rickshaw drivers in Delhi climb into their three-wheelers and spend eight to twelve hours navigating streets where PM2.5 levels routinely exceed World Health Organization safety guidelines by a factor of ten or more. Many of them cough habitually, dismiss it as a smoker's hack or the price of earning a living. But a series of spirometry screening camps organised by the Delhi Traffic Police is now revealing that a substantial fraction of these drivers have chronic obstructive pulmonary disease (COPD) without knowing it.

An Unlikely Screening Ground for Lung Disease

The camps are held at traffic intersections and police depots across the city. A portable spirometer, roughly the size of a paperback book, is connected to a disposable mouthpiece. Drivers are asked to take a deep breath and exhale as hard and fast as possible into the device. Within minutes, the machine produces a flow-volume curve and two key numbers: forced expiratory volume in one second (FEV1) and forced vital capacity (FVC). A ratio of FEV1 to FVC below 0.7 suggests airflow obstruction, the hallmark of COPD.

As of late 2024, roughly 500 drivers had been screened in a pilot phase. Preliminary results, shared by traffic police officials in interviews, indicate that around 15 to 20 percent of participants show obstructive patterns consistent with COPD. Most of these individuals had no prior diagnosis. Many reported chronic cough, breathlessness on exertion, and frequent respiratory infections — symptoms they had normalized as part of their work.

The program is a collaboration between the Delhi Traffic Police and local pulmonologists, including Dr. Randeep Guleria, former director of the All India Institute of Medical Sciences (AIIMS). In media briefings, Dr. Guleria has emphasised that auto-rickshaw drivers represent a sentinel population for air pollution-related lung disease. Their prolonged exposure to traffic fumes, combined with high rates of tobacco use, makes them a group where early detection through spirometry can have outsized impact.

Why Auto Drivers Are a Sentinel Population

Auto-rickshaws in Delhi are typically not equipped with cabin air filters. Drivers sit inches behind the exhaust pipe of the vehicle in front, inhaling a cocktail of particulate matter, nitrogen oxides, and volatile organic compounds. A 2020 study by the Indian Institute of Technology Delhi found that PM2.5 concentrations inside auto-rickshaws during peak traffic hours averaged around 250 micrograms per cubic meter — roughly five times the Indian national ambient air quality standard of 60 micrograms per cubic meter.

Smoking prevalence among auto drivers is high. Surveys conducted by non-governmental organisations in Delhi estimate that 40 to 60 percent of auto-rickshaw drivers smoke tobacco regularly. The combination of occupational fume exposure and smoking synergistically accelerates lung function decline. COPD develops when the airways and air sacs lose their elasticity, often after years of irritation. The disease is progressive and irreversible, but early detection can slow its course through smoking cessation, vaccination, and medication.

The Delhi Traffic Police initiative is not the first to screen high-exposure workers. Similar programs have targeted traffic police officers in Mumbai and Kolkata. But auto-rickshaw drivers are harder to reach. They are self-employed, often lack regular health check-ups, and may avoid government hospitals due to lost wages from waiting times. The police camps bring the test to them, sometimes at the very intersection where they wait for passengers.

Spirometry Mechanics: How the Test Works

Spirometry is one of the oldest and most accessible lung function tests. The patient sits upright, places a nose clip, and seals their lips around a mouthpiece. After a full inhalation, they exhale with maximum force for at least six seconds. The spirometer measures volume over time. The most important derived values are FEV1 and FVC. FEV1 is the volume exhaled in the first second; FVC is the total volume exhaled. A healthy adult typically has an FEV1/FVC ratio above 0.75. A ratio consistently below 0.70 indicates obstruction.

Portable spirometers have become affordable and rugged. The devices used in the Delhi camps cost roughly US$ 200 to $500 each, depending on features. They run on rechargeable batteries and can store hundreds of test results. Software on a connected tablet or smartphone interprets the flow-volume curve and flags abnormal patterns. The test takes about 15 minutes per person, including coaching and repeated attempts to ensure effort-dependent results are valid.

Interpretation requires training. A poor effort — insufficient inhalation or early termination — can produce false positives or negatives. The Delhi camps employ trained technicians who demonstrate the maneuver and encourage maximal effort. Results are later reviewed by a pulmonologist. Drivers with abnormal spirometry are given a referral slip for confirmatory testing, including post-bronchodilator spirometry and chest imaging, at a nearby public hospital.

The Gradient of Respiratory Care Across Wealth

The detection of COPD in an auto-rickshaw driver is only the first step. What happens after diagnosis depends heavily on the patient's economic status. Drivers who earn around US$ 150 to $250 per month often face a stark choice: spend a day's wages on a bus fare to a hospital and wait for hours, or continue driving and ignore the results. Many opt for the latter. Follow-up rates in the Delhi pilot have been low, according to police officials, partly because the free screening camp does not cover the cost of subsequent care.

At the other end of the wealth gradient, patients with COPD in private hospitals in Delhi can access pulmonary rehabilitation programs that include supervised exercise training, nutritional counseling, and psychological support. Biologic therapies, such as monoclonal antibodies targeting specific inflammatory pathways, are available for severe asthma and some COPD phenotypes, but they cost thousands of dollars per year and require specialist administration.

In public hospitals, spirometry itself can be a bottleneck. A 2022 audit of respiratory medicine departments in Delhi's government hospitals found that patients waited an average of three to six months for a spirometry appointment. The portable devices used by the police bypass that queue for screening, but confirmatory testing still faces delays. Some drivers self-medicate with over-the-counter inhalers containing bronchodilators, obtaining them from local pharmacies without a prescription. This practice can provide symptomatic relief but does not address underlying inflammation or disease progression.

The disparity mirrors patterns seen in other chronic respiratory conditions. In Uganda, as reported in a related article on this site, health workers prescribe diazepam for alcohol withdrawal due to a lack of evidence-based protocols and resources. Similarly, in the United States, spirometry rates for COPD diagnosis stall at forty percent of primary care visits, indicating that even in wealthy settings, diagnostic gaps persist.

What the Delhi Data Shows So Far

The pilot screening of roughly 500 drivers has generated enough data to warrant expansion. Around 15 to 20 percent of participants have shown obstructive patterns on spirometry. Among those, about half had moderate or severe obstruction (GOLD stage 2 or higher). Most were unaware of any lung function decline. The average age of drivers with abnormal spirometry was around 45 years, though some were in their thirties. This suggests that occupational exposure can accelerate lung aging by a decade or more.

Smoking was a strong predictor of obstruction. Among drivers who reported smoking more than ten cigarettes per day, the prevalence of abnormal spirometry was roughly double that of non-smokers. However, even among never-smokers, the prevalence of obstruction was higher than expected for the general population. This points to the independent contribution of air pollution.

Follow-up rates have been a challenge. Only about 30 percent of drivers referred for confirmatory testing actually visited a hospital within three months. Cost, distance, and fear of losing a day's income were the most commonly cited barriers. The police are considering ways to reduce these barriers, such as scheduling follow-up camps at the same locations or partnering with mobile health clinics.

The Delhi Traffic Police plans to expand the camps citywide, aiming to screen several thousand drivers over the next year. They are also exploring partnerships with insurance companies to cover treatment costs for drivers diagnosed with COPD. But scaling up requires sustained funding and political will. Spirometry camps are cheap relative to tertiary care, but they are not free, and they compete with other public health priorities.

Tackling the Root Causes Beyond Screening

Screening alone cannot solve the problem. The root causes of COPD among auto-rickshaw drivers are embedded in Delhi's air quality, vehicle emissions, and occupational conditions. Stricter enforcement of emission norms for auto-rickshaws is one obvious lever. Many auto-rickshaws run on compressed natural gas (CNG), which is cleaner than petrol or diesel, but older models and poorly maintained engines still emit high levels of particulates. The Delhi government has mandated that all auto-rickshaws switch to CNG, but compliance is uneven, and electric rickshaws remain a small fraction of the fleet.

Mask use during peak traffic hours is rare. N95 or equivalent masks can reduce inhalation of fine particles, but they are uncomfortable to wear for long periods in Delhi's heat and humidity. Drivers who wear masks often reuse disposable ones beyond their intended lifespan. Subsidized distribution of high-quality masks, combined with education on proper use, could be a low-cost intervention.

Primary care integration for chronic respiratory disease is another gap. India's National Programme for Prevention and Control of Non-Communicable Diseases includes COPD, but screening and management are unevenly implemented. Training community health workers to perform basic spirometry and to counsel patients on smoking cessation could extend the reach of the police camps. The World Health Organization's Package of Essential Non-Communicable Disease Interventions (PEN) includes protocols for COPD management at primary care level, but adoption in Delhi's urban slums remains limited.

Practical Takeaways for Other Megacities

The Delhi model could be replicated in other megacities with high traffic density and poor air quality, such as Lagos, Jakarta, or Mexico City. Portable spirometry devices are affordable and rugged. Training local health workers to administer the test takes a few days. The key is to target high-exposure groups first: auto-rickshaw drivers, taxi drivers, traffic police, and street vendors. Pairing screening with smoking cessation counseling and influenza/pneumococcal vaccination can amplify the benefit.

Cost is a barrier but not an insurmountable one. A spirometry device costs roughly US$ 200 to $500, and disposable mouthpieces cost less than a dollar each. A camp screening 100 drivers per day might cost a few hundred dollars in supplies and personnel time. The return on investment, in terms of years of disability avoided and productivity preserved, is likely substantial. A 2021 modeling study from the University of Chicago's Energy Policy Institute estimated that reducing PM2.5 levels in Delhi to meet WHO guidelines would add roughly four years to the average life expectancy. Screening and treatment are complements to, not substitutes for, clean air policies.

Critics of screening programs argue that they can cause harm if follow-up care is not available. A positive spirometry result in a driver who cannot afford treatment may cause anxiety without benefit. The Delhi program has tried to mitigate this by providing referral pathways and, in some cases, free medications through a charitable trust. But the broader lesson is that screening should be embedded in a system that can deliver care. As private insurer prior authorization blocks sepsis rapid-response protocols in the United States, so too can fragmented health systems undermine well-intentioned screening programs.

Counter-Arguments and Trade-Offs in Screening

Not all public health experts endorse the Delhi police's approach. Some argue that diverting resources toward screening a single occupational group, however vulnerable, may not be the most efficient use of limited funds. In a city where the majority of residents breathe hazardous air, they contend, universal primary care strengthening might yield greater population-level benefit than targeted screening camps. The counter-argument is that auto-rickshaw drivers face an exposure burden far above the average Delhiite, and that early detection in this group can prevent rapid progression to disability, which would impose higher costs on the health system later. The trade-off is between equity (reaching the most exposed) and efficiency (reaching the most people per rupee).

Another tension involves the choice of screening tool. Portable spirometry is convenient but less accurate than laboratory-based post-bronchodilator testing. Some drivers with abnormal screening results may have reversible airway obstruction due to asthma rather than fixed COPD. Distinguishing between the two has treatment implications: asthma typically responds to inhaled corticosteroids, while COPD management emphasizes bronchodilators and pulmonary rehabilitation. The Delhi camps refer all abnormal results for confirmatory testing, but the delay in follow-up means that some drivers may receive inappropriate over-the-counter medications in the interim. A more integrated approach—where spirometry is paired with a bronchodilator challenge at the point of screening—could improve diagnostic accuracy, but it would require additional equipment and trained personnel, raising costs.

There is also the question of sustainability. The pilot phase was funded through a combination of police department budget allocations and donations from pharmaceutical companies. Scaling up to screen thousands of drivers annually will require a dedicated funding stream. The police are exploring partnerships with corporate social responsibility programs and health insurance firms, but these arrangements can introduce conflicts of interest or conditionality. For example, an insurer might agree to cover treatment costs only for drivers who purchase a policy, excluding those who cannot afford premiums. The program's architects must navigate these trade-offs carefully to maintain its public-health orientation.

Lessons from Similar Screening Programs in Other Countries

Occupational lung disease screening is not unique to Delhi. In Bangladesh, a program targeting rickshaw pullers in Dhaka used portable spirometry and found that roughly 25 percent had abnormal lung function, with prevalence higher among those who worked more than 10 hours per day. That program also struggled with follow-up, but it succeeded in establishing a referral network with a local chest hospital. In Kenya, a screening initiative for matatu (minibus) drivers in Nairobi combined spirometry with blood pressure and blood glucose checks, recognizing that non-communicable disease risk factors cluster in the same occupational group. The Kenyan program reported that about 40 percent of drivers with abnormal spirometry had never visited a doctor for respiratory symptoms—a finding consistent with Delhi's experience.

In Mexico City, the health department has deployed mobile clinics equipped with spirometers to screen taxi drivers and street vendors. They also provided free influenza and pneumococcal vaccines on site, achieving higher vaccination coverage than in the general adult population. A cost-effectiveness analysis of that program, published in 2023, estimated that every dollar spent on screening and vaccination saved approximately US$ 3.50 in future hospitalization costs for COPD exacerbations and pneumonia. Such data could help the Delhi program make the case for sustained funding.

However, each city's context differs. Delhi's air pollution levels are among the highest globally, and its auto-rickshaw fleet is unusually large—estimated at around 100,000 vehicles. The scale of the problem may require a solution that goes beyond screening, such as accelerating the transition to electric rickshaws. The Delhi government has announced subsidies for electric auto-rickshaws, but adoption has been slow due to higher upfront costs and limited charging infrastructure. A comprehensive strategy would pair screening with policy measures that reduce exposure at the source.

What Happens Next for the Drivers Diagnosed with COPD

For the roughly 75 to 100 drivers identified with moderate-to-severe obstruction in the pilot, the immediate next steps are critical. Those who attend follow-up at a public hospital are typically prescribed inhaled bronchodilators—either a long-acting beta-agonist (LABA) or a long-acting muscarinic antagonist (LAMA), or a combination. These medications can improve symptoms and reduce exacerbation frequency, but they must be taken daily. Adherence is often poor among drivers who work long hours and have irregular schedules. Some drivers report that they forget to use their inhaler during the workday or that they cannot afford to refill prescriptions regularly. The cost of a monthly supply of combination inhalers in India ranges from roughly US$ 5 to $15, depending on the brand and whether purchased from a government pharmacy or a private retailer. For a driver earning US$ 150 to $250 per month, that is a significant but not prohibitive expense—yet many still forgo it.

Smoking cessation is arguably the most impactful intervention for drivers who smoke. The Delhi camps include brief counseling, but sustained quit rates are low without pharmacotherapy and follow-up support. Nicotine replacement therapy (gum, patches) is available over the counter in India but costs around US$ 10 to $20 per week—again, a barrier for daily wage earners. The government's tobacco cessation helpline and clinic network is underutilized. Integrating a cessation program into the screening camps, perhaps with free nicotine patches donated by a philanthropic organization, could significantly boost quit rates.

Pulmonary rehabilitation is another evidence-based intervention that is rarely accessible to low-income patients in Delhi. It involves structured exercise training, education, and psychosocial support over 6 to 12 weeks. A few public hospitals offer it, but waiting lists are long. For auto-rickshaw drivers, attending even twice a week would mean losing income. Home-based rehabilitation programs, delivered via smartphone apps or community health workers, are being tested in other settings and could be adapted for Delhi. The police camps could serve as a recruitment point for such programs, linking drivers to digital health platforms that provide exercise instructions and symptom tracking.

For now, the Delhi Traffic Police spirometry camps are a pragmatic response to a chronic crisis. They are not a cure for Delhi's air, but they are a concrete step toward identifying those who are already sick. Whether that identification leads to treatment, behavior change, and policy action will determine whether the program becomes a model or a missed opportunity.

This article is for informational purposes only and does not constitute medical advice. Individuals concerned about lung health should consult a qualified healthcare professional.