Nemours PM10 (pm10) Levels

🔬What is PM10?

PM10 includes inhalable particles with a diameter of 10 micrometres or less. While larger than PM2.5, these particles still penetrate the respiratory system and cause irritation to the eyes, nose, and throat.

🏭How is PM10 Produced?

PM10 particles are generated mainly through mechanical processes rather than combustion. Road dust kicked up by vehicles is the single largest source in many cities — tyres grinding against asphalt and the turbulence from moving vehicles resuspend settled dust. Construction and demolition activity, mining operations, agricultural tilling, and industrial material handling (crushing, grinding, screening) are other major sources. Natural sources include windblown soil and desert dust (Saharan dust can travel thousands of kilometres), pollen, mould spores, and sea spray. PM10 also includes all PM2.5 particles, since anything smaller than 2.5 µm is also smaller than 10 µm.

🫁Health Effects

PM10 particles are small enough to be inhaled into the upper airways and bronchial passages, though most are filtered by the nose and throat before reaching the deep lungs.

Short-term exposure: coughing, sneezing, runny nose, and eye irritation; aggravation of asthma and chronic bronchitis; increased emergency room visits for respiratory complaints.

Long-term exposure: reduced lung function growth in children, chronic respiratory disease, and increased susceptibility to respiratory infections. While PM10 is less harmful than PM2.5 on a per-unit basis, it still contributes to premature mortality — the WHO estimates a 0.2–0.6% increase in daily mortality per 10 µg/m³ rise in PM10.

Most vulnerable: children (who breathe more air per kilogram of body weight), outdoor workers, cyclists, and people with asthma or COPD.

🌍Environmental Impact

PM10 reduces visibility and soils buildings, monuments, and vehicles. Dust deposition on plant leaves reduces photosynthesis and crop yields. In arid regions, dust storms carrying PM10 can strip topsoil and degrade agricultural land. When PM10 settles on water bodies, it can alter nutrient balances and affect aquatic life. Coarse particles also carry metals and pesticides adsorbed onto their surface, contaminating soil and waterways when deposited.

🛡️How to Protect Yourself

Avoid outdoor exercise on dusty or windy days when PM10 levels spike. Keep car windows closed when driving on unpaved roads. Wet-mop floors instead of dry-sweeping to avoid resuspending settled dust. Use an air purifier with HEPA filter — effective for both PM10 and PM2.5. If working in dusty occupations (construction, mining), use appropriate respiratory protection (P100 or N95 masks).

📏Safe Levels & Guidelines

WHO (2021): 15 µg/m³ annual mean, 45 µg/m³ 24-hour mean.

US EPA NAAQS: 150 µg/m³ 24-hour (no annual standard since 2006 revision).

EU Directive: 40 µg/m³ annual mean, 50 µg/m³ 24-hour (max 35 exceedances/year).

India NAAQS (CPCB): 60 µg/m³ annual mean, 100 µg/m³ 24-hour mean.

Many developing countries routinely exceed even the most lenient PM10 standards, particularly during dry seasons and near construction zones.

📡How is PM10 Measured?

PM10 is measured with size-selective inlets that use impactors or cyclones to separate particles larger than 10 µm. Reference methods use 24-hour gravimetric sampling with weighed filters. Continuous monitors include Beta Attenuation Monitors (BAM) and TEOM — similar to PM2.5 instruments but with a different size-selective inlet. Some stations use high-volume samplers (Hi-Vol) that collect larger sample masses for detailed chemical analysis.

💡Key Facts

A single car travelling on an unpaved road can generate over 1 kg of PM10 per kilometre.

Saharan dust storms can carry PM10 across the Atlantic Ocean, raising particulate levels in the Caribbean and southeastern United States.

Indoor PM10 sources include vacuuming without a HEPA filter, pet dander, and cooking — frying can generate PM10 concentrations 10× above outdoor levels.

Paving roads is one of the most cost-effective measures to reduce urban PM10 — it can cut roadside concentrations by 40–60%.