| Acronym | Meaning |
 | CPD | Cyclobutane Pyrimidine Dimer |
| RDNP | Reverse Differential Normal Pulse |
| NEWS | National Surface Water Survey (USEPA) |
| APF | Advanced Particle Filter |
| NAT | Nitric Acid Trihydrate (polar Stratosphere Cloud Aerosol) |
| COBE | Cosmic Background Explorer Satellite (NASA) |
| EMAS | Eco-Management & Audit Scheme |
| OTAG | Ozone Transport Assessment Group |
| HFCC | Hyperfine Coupling Constant |
| PINN | Proposed International Nonproprietary Names (for Drugs) |
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