| BC | black carbon |
| CO | carbon monoxide |
| FeNO | Fractional exhaled Nitric Oxide |
| FEV1 | Force Expiratory Volume in 1 s |
| MMEF | Maximal Mid-Expiratory Flow |
| NO2 | nitrogen dioxide |
| PEFR | Peak Expiratory Flow Rate |
| PMC | Particle Mass Concentration |
| PM | Particulate Matter |
| PM0.1 | PM smaller than 0.1 microns |
| PM1 | PM smaller than 1 micron |
| PM2.5 | PM smaller than 2.5 microns |
| PM10 | PM smaller than 10 microns |
| PNC | size-specific Particle Number Concentration |
| PRISMA | Preferred Reporting Items for Systematic reviews and Meta-Analyses |
| PSC | Particle Surface area Concentration |
| RCT | Randomized Control Trial |
| UFP | Ultrafine particles |
| WHO | World Health Organization |
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