Asthma meds save lives—but some of the devices we use to deliver them are quietly warming the planet. Fresh studies from SingHealth Polyclinics (SHP) put numbers to that trade-off and point to a practical win-win: better asthma control for patients and fewer emissions for everyone.

The headline findings

• Propellant inhalers add up. The familiar L-shaped metered-dose inhalers (MDIs) use hydrofluorocarbon (HFC) propellants. On average in 2023, one patient’s yearly MDI use equated to ~140 kg of CO₂e—about the emissions from driving a petrol car ~97 km.
• Lower-footprint options exist. Dry-powder inhalers (DPIs), which rely on your own breath to draw medication in, averaged ~121 kg CO₂e per patient per year in the same analysis.
• Control beats crisis. The biggest climate gains come from preventing frequent reliever use. Patients who were poorly controlled—and reaching for their rescue inhaler often—drove far more emissions than those with stable control.

Why this matters in Singapore

• More than 1 in 10 people here will experience asthma at some point; 1 in 25 adults currently live with it.
• Singapore’s asthma hospitalisation rate is ~3× that of the US, underscoring the need for tighter day-to-day control.

About the research

SHP analysed records from 23,000+ adult patients (2015–2023) and published two papers in Primary Care Respiratory Medicine (Nature portfolio) in mid-2025. Their conclusions echo a 2024 NUH review that highlighted the outsized warming impact of inhaler propellants and estimated inhalers contribute ~0.32% of NUH’s overall emissions.

What patients can do (with your clinician)

• Aim for control, not catch-up. Regular preventer therapy and trigger management mean fewer flare-ups—and fewer rescue puffs.
• Ask about DPIs. If clinically suitable and you can generate a strong, steady inhalation, DPIs may be a lower-footprint choice.
• Use technique check-ins. Poor technique wastes medicine and increases the need for extra doses. A quick demo with your pharmacist or nurse can help.
• Track your reliever use. Needing your blue inhaler more than occasionally is a red flag—raise it at your next review.

What the system can do

• Therapy optimisation first. Clinicians should prioritise guideline-based control (stepped care, adherence support, trigger reduction) before device switching.
• Greener device pathways. Where appropriate, offer DPI alternatives and phase down high-GWP propellants as newer

Public Reactions to the Asthma Inhaler Emissions Report: Between Outrage and Irony

When The Straits Times published a study showing that common asthma inhalers contribute to carbon emissions, Singaporeans didn’t hold back. What was meant as a public health and climate awareness piece quickly spiraled into a social media storm of disbelief, humour, and frustration.

1. The disbelief: “Are they serious?”

Many readers were baffled that scientists would even study inhalers’ carbon footprints. Comments like “Are you serious? Breathing also produces CO₂!” and “Maybe they should target buses and lorries first before going after asthma patients” captured the general tone. Some joked about “green taxes on breathing” or asked whether “farting” would be the next target.

Others felt the research was out of touch with real priorities. “Who funds this nonsense?” one asked, calling it a waste of taxpayer money. Another quipped that scientists should “study how to cure asthma instead.”

2. The irony and humour: Laughing through disbelief

Amid the outrage came wit. One commenter noted, “Sorry asthma patients, you’ve now been put in the same category as cows.” Another added, “Humans who breathe also exhale CO₂—maybe they should stop us from breathing next.” The absurdity of measuring emissions from medical devices became a running joke.

3. The empathy gap: “Victim blaming?”

Beyond the laughter, several users raised a deeper ethical concern. Why focus on patients who rely on inhalers to stay alive? “Victim blaming?” asked one commenter bluntly. Others drew comparisons to the much larger emissions from cars, planes, and factories, calling for fairness: “Why target regular individuals when industries and billionaires cause the real damage?”

4. The confusion: Mixed messages in healthcare

Some commenters pointed out inconsistencies between hospitals. While the study from SingHealth Polyclinics suggested propellant inhalers have a higher carbon footprint, others noted that institutions like KKH still rely heavily on them for efficacy. This led to criticism that the medical community should “at least have some consensus before making such claims.”

5. The bigger picture: A failure to communicate nuance

While the study itself focused on improving asthma control (and thus reducing unnecessary inhaler use), the public conversation quickly shifted to anger over perceived insensitivity. The core message—that better-managed asthma is both medically and environmentally beneficial—was drowned out by sarcasm and distrust.

Conclusion:

The comments reflect a growing tension between environmental messaging and everyday realities. People are willing to go green—but not when it feels like patients are being shamed for breathing. The backlash shows that climate communication in healthcare needs empathy, clarity, and above all, perspective: saving the planet shouldn’t come at the cost of making patients feel guilty for staying alive.