Air-Purifying Plants & Household Air Pollution: Why Indoor Air Needs Urgent Attention
Table of Contents
Source: Down To Earth, WHO,
Relevance: GS-III: Environment
Key Concepts for Prelims and Mains:
For Prelims:
Indoor Air Pollution (IAP), Household Air Pollution (HAP), Indoor Air Quality (IAQ), Particulate Matter (PM₂.₅ / PM₁₀), VOCs (benzene, toluene, xylene), Carbon Monoxide (CO), Nitrogen Dioxide (NO₂), Sulphur Dioxide (SO₂), Ozone, Black Carbon, Methane (SLCPs), Biomass Fuels (wood, dung, crop residue), Kerosene Lamps, COPD, Spirometry, Air-Purifying Plants
For Mains:
- Indoor air pollution as a silent killer, Livelihood risks from indoor pollution, Climate co-benefits of clean cooking, Black carbon emissions, Indoor green infrastructure, Nature-based solutions (NbS),
Why in News?
Indoor air pollution has re-emerged as a major public health concern after new findings revealed that indoor air can be 2.5 times more polluted than outdoor air, and in extreme cases, up to 100 times worse. This deterioration—caused by harmful substances, household materials and everyday emissions—contributes to 4.1% of global deaths annually, prompting renewed discussion on affordable mitigation measures such as air-purifying plants.
Indoor Air Pollution: Definition, Key Pollutants
Indoor air pollution refers to contamination of air inside homes, offices, schools and closed environments.
It affects 4.1% of global deaths annually and remains a “silent killer” in developing countries.Major Indoor Pollutants
- Carbon monoxide (CO)
- Nitrogen dioxide (NO₂)
- Sulphur dioxide (SO₂)
- Ozone
- Particulate Matter (PM₂.₅ / PM₁₀)
- VOCs (benzene, toluene, xylene, ethyl benzene) from:
- wall paint, adhesives, furnishings
- cooking and heating
- mosquito repellents, deodorants
- fabrics and synthetics
- human respiration
India does not have a uniform IAQ protocol, complicating monitoring and enforcement.
Health Impacts: What WHO Data Shows
Annual Global Burden
- 3.2 million deaths every year due to household air pollution.
- 86 million healthy life years lost in 2019 (DALYs).
- Major burden falls on women and children in LMICs.
Breakdown of Deaths Linked to Household Air Pollution
- 32% – Ischaemic Heart Disease
- 23% – Stroke
- 21% – Lower Respiratory Infections (LRI)
- 44% of pneumonia deaths in children under 5
- 19% – Chronic Obstructive Pulmonary Disease (COPD)
- 6% – Lung Cancer
What is Chronic Obstructive Pulmonary Disease (COPD)?
What is COPD?
- A progressive and irreversible lung disease causing long-term breathing difficulty.
- Characterised by inflammation, narrowing of airways, and damage to alveoli (air sacs).
Key Causes
- Tobacco smoking (active + passive) – leading cause
- Indoor air pollution (biomass: wood, dung, crop residue; coal; kerosene)
- Occupational exposure — dust, fumes, chemicals
- Childhood respiratory infections, poor lung growth
- Asthma in childhood
Diagnosis
- Suspected with typical symptoms.
- Confirmed by spirometry (measures lung function).
- Often missed in LMICs due to lack of diagnostic facilities.
Complications
People with COPD have higher risk of:
- Pneumonia, flu
- Lung cancer
- Heart disease
- Weak bones, muscle loss
- Depression & anxiety
Preventive Measures
- Stop smoking
- Reduce indoor air pollution
- Ensure ventilation
- Use clean fuels
- Get vaccines (flu & pneumonia)
Best Indoor Air-Purifying Plants
- Areca Palm (Dypsis lutescens)
- Weeping Fig (Ficus benjamina)
- Spider Plant (Chlorophytum comosum)
- Peace Lily (Spathiphyllum wallisii)
- Bamboo Palm (Chamaedorea seifrizii)
These plants are low-maintenance, suitable for Indian homes, and effective against VOCs, PM, SO₂, and NO₂.
Beyond Plants: Development, Equity & Climate Linkages
Health Inequality
- Poor households using biomass and kerosene face the highest indoor pollution and health risks.
- Women and children remain the most exposed.
Livelihood & Time Poverty
- Fuelwood collection reduces time for education and paid work.
- Illness from IAP reduces household income and increases medical expenditure.
Climate Change
- Traditional stoves emit black carbon and methane, short-lived climate pollutants with high warming potential.
Safety Risks
- Burns, accidental fires and kerosene poisoning are common in dense slum settlements.
Policy & Programme Response
Clean Cooking Initiatives
- Pradhan Mantri Ujjwala Yojana (PMUY) for LPG access; improving refill affordability remains crucial.
Energy & Building Policies
- Need for national IAQ standards, building codes mandating ventilation and low-emission materials.
Urban Missions
- Smart Cities / AMRUT can integrate green building norms, rooftop gardens and indoor greening.
Public Health
- IAP should be integrated into National Health Mission, TB and NCD control strategies.
Way Forward
Adopt IAQ Standards & Monitoring
- MoEFCC + MoHFW + BIS to frame India-specific IAQ norms and certify low-emission paints, furnishings, appliances.
Scale Up Clean Fuels
- Strengthen PMUY with targeted subsidies, last-mile LPG delivery, electric/biogas cooking pilots.
Promote Indoor Green Infrastructure
- Encourage air-purifying plants in schools, anganwadis, hospitals, metro stations and low-income housing.
Behavioural Change
- Simple practices: cross-ventilation, avoiding trash burning, limiting incense/coil use, safe storage of chemicals.
Focus on Vulnerable Groups
- Women-centric awareness programmes, inclusion of IAP in maternal & child health counselling.
CARE MCQ
Q. Consider the following plants often recommended for improving indoor air quality:
- Areca palm (Dypsis lutescens)
- Weeping fig (Ficus benjamina)
- Spider plant (Chlorophytum comosum variegatum)
- Peace lily (Spathiphyllum wallisii)
- Bamboo palm (Chamaedorea seifrizii)
How many of the above are commonly used as low-maintenance air-purifying indoor plants?
(a) Only two
(b) Three
(c) Four
(d) All five
Answer: (d) All five