HCl (hydrochloric acid)
type: Concept
notation: 288

n-C4H10 (n-butane)
type: Concept
notation: 501

Watervapor profile
type: Concept
notation: 256

Vanadium (V), total aerosol
type: Concept
notation: 722

C6Hn (n={14, 12}; sum of 3-methylpentane & cyclohexane)
type: Concept
notation: 477

Air temperature (at specified distance from reference surface)
type: Concept
notation: 224

Sunshine duration
type: Concept
notation: 270

Lead (Pb), total aerosol
type: Concept
notation: 698

C3H8 (propane)
type: Concept
notation: 445

CH3CHO (acetaldehyde, ethanal)
type: Concept
notation: 491

C2O4= (oxalate, ethanedioate), total aerosol
type: Concept
notation: 666

Hygroscopic growth factor, 110 μm equivalent
type: Concept
notation: 413

Calcium (Ca++), total aerosol
type: Concept
notation: 634

Barium (Ba), total aerosol
type: Concept
notation: 680

Copper (Cu)
type: Concept
notation: 602

Cloud hydrometeor concentration
type: Concept
notation: 182

UV Erythemally weighted
type: Concept
notation: 357

Propionate (C2H5COO-)
type: Concept
notation: 578

Multiwavelength optical depth, total aerosol
type: Concept
notation: 325

Number size distribution, total aerosol
type: Concept
notation: 371

Magnesium (Mg++)
type: Concept
notation: 546

Total lightning density
type: Concept
notation: 12001

CCl2F2 (dichlorodifluoromethane, CFC-12)
type: Concept
notation: 592

C4H5F5 (1,1,1,3,3-pentafluorobutane, HFC-365mfc)
type: Concept
notation: 560

Mercury (Hg), total aerosol
type: Concept
notation: 703

CHCl3 (chloroform)
type: Concept
notation: 283

C5H10 (sum of 1-pentene & 2-methyl-2-butene)
type: Concept
notation: 458

H2
type: Concept
notation: 205

Humidity (at specified distance from reference surface)
type: Concept
notation: 251

Barium (Ba), PM2.5
type: Concept
notation: 679

C6H14 (2-methylpentane)
type: Concept
notation: 472

Ammonium (NH4+), total aerosol
type: Concept
notation: 647

Copper (Cu), total aerosol
type: Concept
notation: 693

C3H4O (prop-2-enal, acrolein)
type: Concept
notation: 440

Chloride (Cl-), PM10
type: Concept
notation: 615

CO2 [C-13]
type: Concept
notation: 195

Other chemical components (fine)
type: Concept
notation: 661

C14H10 (anthracene), in air
type: Concept
notation: 338

C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in air
type: Concept
notation: 384

C3HF7 (1,1,1,2,3,3,3-Heptafluoropropane, HFC-227ea)
type: Concept
notation: 559

Global solar radiation (downwelling)
type: Concept
notation: 573

Light backscattering coefficient, PM10
type: Concept
notation: 320

Iodide (I-)
type: Concept
notation: 541

Thorium (Th), total aerosol
type: Concept
notation: 716

Hydrogen ion (H+) or pH
type: Concept
notation: 296

Pressure tendency
type: Concept
notation: 218

Vertical ozone profile
type: Concept
notation: 264

C3H4 (propyne)
type: Concept
notation: 439

C8H10 (o-xylene)
type: Concept
notation: 485

C5H10 (1-pentene)
type: Concept
notation: 453

Aluminium (Al), total aerosol
type: Concept
notation: 674

CF4 (tetrafluoromethane, carbon tetrafluoride, perfluoromethane, PFC-14)
type: Concept
notation: 421

Sodium (Na+), PM2.5
type: Concept
notation: 642

NOx
type: Concept
notation: 397

Light backscattering coefficient, PM1
type: Concept
notation: 319

Mass concentration (fine) or Mass PM1
type: Concept
notation: 365

CBrF3 (bromotrifluoromethane, Halon 1301)
type: Concept
notation: 333

Optical depth within each layer
type: Concept
notation: 508

C2H2F4 (1,1,1,2-tetrafluoroethane, HFC-134a)
type: Concept
notation: 554

Aerosol volcanic ash (Total column)
type: Concept
notation: 729

Hydrometeor radius
type: Concept
notation: 522

CH2Br2 (dibromomethane)
type: Concept
notation: 277

i-C4H8 (2-methylpropene, iso-butene)
type: Concept
notation: 498

Strontium (Sr), PM2.5
type: Concept
notation: 711

ROOH
type: Concept
notation: 291

C5Hn (n={10, 8}; sum of 3-methyl-1-butene & cyclopentene)
type: Concept
notation: 466

Occurrence of precipitation during last period (yes/no)
type: Concept
notation: 213

Cadmium (Cd), total aerosol
type: Concept
notation: 687

C2H2 (ethyne, acetylene)
type: Concept
notation: 434

Zinc (Zn)
type: Concept
notation: 609

C7H16 (sum of methylhexanes)
type: Concept
notation: 480

Sum of nitric acid (HNO3) and nitrate (NO3-), in air and aerosol
type: Concept
notation: 655

Elemental carbon (coarse), PM10
type: Concept
notation: 623

C12H8Cl6 (aldrin), in total precipitation
type: Concept
notation: 378

Cadmium (Cd)
type: Concept
notation: 599

C18H12 (Benz(a)anthracene), PM10
type: Concept
notation: 346

ClONO2 (chlorine nitrate)
type: Concept
notation: 392

Long-wave radiation (upwelling)
type: Concept
notation: 567

Aerosol Absorption Optical Depth
type: Concept
notation: 314

C2H3ClF2 (1-chloro-1,1-difluoroethane, HCFC-142b)
type: Concept
notation: 535

n-C7H16 (n-heptane)
type: Concept
notation: 503

Lightning discharge polarity
type: Concept
notation: 258

Zinc (Zn), total aerosol
type: Concept
notation: 724

Integrated air samples
type: Concept
notation: 44

C6Hn (n={14, 12}; sum of 2,3-dimethylbutane & methylcyclopentane
type: Concept
notation: 479

Extreme temperature (min, max) (at specified distance from reference surface)
type: Concept
notation: 226

C4H6O (2-methylprop-2-enal, methacrolein)
type: Concept
notation: 447

CH3OH (methanol)
type: Concept
notation: 493

CH3O3S- (methanesulphonate), total aerosol
type: Concept
notation: 668

Hygroscopic growth factor, 35 μm equivalent
type: Concept
notation: 415

C5H12 & C4H8 (sum of 2,2-dimethylpropane & c-2-butene)
type: Concept
notation: 461

Magnesium (Mg++), PM2.5
type: Concept
notation: 636

Bismuth (Bi), total aerosol
type: Concept
notation: 682

Lead (Pb)
type: Concept
notation: 604

UV Spectral
type: Concept
notation: 359

Nitrate (NO3-), PM10
type: Concept
notation: 650

Cloud ice
type: Concept
notation: 327

Cloud liquid water (CLW)
type: Concept
notation: 373

Sodium (Na+)
type: Concept
notation: 548

CCl4 (carbon tetrachloride)
type: Concept
notation: 594

C14H10 (phenanthrene), in air
type: Concept
notation: 341

CHF3 (trifluoromethane, HFC-23)
type: Concept
notation: 562

State of ground
type: Concept
notation: 57

Nickel (Ni), total aerosol
type: Concept
notation: 705

COF2 (difluoromethanal, carbonyl fluoride)
type: Concept
notation: 285

HDO (as a chemical species)
type: Concept
notation: 207

Mass mixing ratio
type: Concept
notation: 253

COS (OCS, carbon oxide sulfide, carbonyl sulfide)
type: Concept
notation: 428

C6H14 (n-hexane)
type: Concept
notation: 474

Krypton [Kr-85]
type: Concept
notation: 221

Ammonium nitrate (NH4NO3), PM1
type: Concept
notation: 649

Lanthanum (La), PM2.5
type: Concept
notation: 695

C3H6 (propene)
type: Concept
notation: 442

Chloride (Cl-), total aerosol
type: Concept
notation: 617

C2H3O2- (CH3COO-, acetate), in aerosol
type: Concept
notation: 663

Strong acids
type: Concept
notation: 529

Light scattering coefficient, PM1
type: Concept
notation: 322

Sulphate (SO4=), corrected
type: Concept
notation: 543

Tin (Sn), total aerosol
type: Concept
notation: 718

Present weather
type: Concept
notation: 266

C9H12 (1,2,4-trimethylbenzene)
type: Concept
notation: 487

Lithium (Li), total aerosol
type: Concept
notation: 700

CH3Cl (methylchloride)
type: Concept
notation: 280

C5H10 (2-methyl-2-butene)
type: Concept
notation: 455

Antimony (Sb), total aerosol
type: Concept
notation: 676

Ammonia (NH3), PM2.5
type: Concept
notation: 644

Chromium (Cr), total aerosol
type: Concept
notation: 690

CH4
type: Concept
notation: 192

Mass concentration (size fractionated)
type: Concept
notation: 367

C14H10 (anthracene), PM10
type: Concept
notation: 335

C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in aerosol
type: Concept
notation: 381

C2HF5 (pentafluoroethane, HFC-125)
type: Concept
notation: 556

Lithometeor type
type: Concept
notation: 524

CH3Br (methylbromide)
type: Concept
notation: 279

Nitrite (NO2-)
type: Concept
notation: 570

Thallium (Tl), PM2.5
type: Concept
notation: 713

C6H12 (cyclohexane)
type: Concept
notation: 468

Type of precipitation
type: Concept
notation: 215

Cerium (Ce), total aerosol
type: Concept
notation: 689

C2H4 (ethene)
type: Concept
notation: 436

C7H8 (toluene)
type: Concept
notation: 482

Major inorganic components (TSP)
type: Concept
notation: 657

C4H8 (sum of butenes)
type: Concept
notation: 450

Elemental carbon, PM2.5
type: Concept
notation: 625

Carbonaceous-organic material (fine)
type: Concept
notation: 671

C18H12 (Benz(a)anthracene), in air
type: Concept
notation: 348

HNO3 (nitric acid)
type: Concept
notation: 394

Nitrate (NO3-)
type: Concept
notation: 569

Light absorption coefficient, PM1
type: Concept
notation: 316

Aerosol effective radius
type: Concept
notation: 362

CHClF2 (chlorodifluoromethane, HCFC-22)
type: Concept
notation: 537

Freezing level height in clouds
type: Concept
notation: 330

t-C5H10 (trans-2-pentene)
type: Concept
notation: 505

Type of high clouds
type: Concept
notation: 551

BrO (bromine monoxide)
type: Concept
notation: 274

C4H8 (1-butene)
type: Concept
notation: 449

c-C4H8 (cis-2-butene)
type: Concept
notation: 495

Hygroscopic growth factor, 75 μm equivalent
type: Concept
notation: 417

C5H14 (2,3-dimethylbutane)
type: Concept
notation: 463

Amount of precipitation
type: Concept
notation: 210

Potassium (K+), PM10
type: Concept
notation: 638

Cadmium (Cd), PM10
type: Concept
notation: 684

Lightning detection (time and location)
type: Concept
notation: 431

Mercury (Hg)
type: Concept
notation: 606

Melting layer depth in clouds
type: Concept
notation: 186

Nitrate (NO3-), total aerosol
type: Concept
notation: 652

Cloud ice effective radius
type: Concept
notation: 329

Sulphate (SO4=), total
type: Concept
notation: 620

C12H8Cl6 (aldrin), in aerosol
type: Concept
notation: 375

Horizontal wind direction at specified distance from reference surface
type: Concept
notation: 12005

C14H10 (phenanthrene), in wet deposition
type: Concept
notation: 343

Height of cloud top
type: Concept
notation: 532

Phosphorous (P), total aerosol
type: Concept
notation: 707

H2O2 (hydrogen peroxide)
type: Concept
notation: 287

i-C7H16 (2-methylhexane, isoheptane)
type: Concept
notation: 500

Water vapour pressure
type: Concept
notation: 255

Vanadium (V), PM2.5
type: Concept
notation: 721

C6H6 (benzene)
type: Concept
notation: 476

Radon [Rn-222]
type: Concept
notation: 223

Lead (Pb), PM10
type: Concept
notation: 697

C3H6O (propanal)
type: Concept
notation: 444

Sulphate (SO4=), corrected
type: Concept
notation: 619

CH3CH2OH (ethanol)
type: Concept
notation: 490

C2O4= (oxalate, ethanedioate), PM10
type: Concept
notation: 665

CCN concentration spectra
type: Concept
notation: 412

Calcium (Ca++), PM2.5
type: Concept
notation: 633

Cobalt (Co)
type: Concept
notation: 601

Cloud drop effective radius
type: Concept
notation: 181

UV Broadband
type: Concept
notation: 356

Formate (HCOO-)
type: Concept
notation: 577

Light scattering coefficient, total aerosol
type: Concept
notation: 324

Number size distribution, PM10
type: Concept
notation: 370

Calcium (Ca++)
type: Concept
notation: 545

Atmospheric pressure profile
type: Concept
notation: 12000

C2ClF5 (1-chloro-1,1,2,2,2-pentafluoroethane, CFC-115)
type: Concept
notation: 591

CH2O (formaldehyde)
type: Concept
notation: 489

Manganese (Mn), total aerosol
type: Concept
notation: 702

CHBr3 (bromoform)
type: Concept
notation: 282

C5H10 (cyclopentane)
type: Concept
notation: 457

SO2F2 (sulphuryl fluoride)
type: Concept
notation: 204

Turbulence type (low levels and wake vortex)
type: Concept
notation: 250

Arsenic (As), total aerosol
type: Concept
notation: 678

C6H14 (2,2-dimethylbutane)
type: Concept
notation: 471

Ammonium (NH4+), PM2.5
type: Concept
notation: 646

Copper (Cu), PM10
type: Concept
notation: 692

Chloride (Cl-), PM1
type: Concept
notation: 614

CO2
type: Concept
notation: 194

Number concentration
type: Concept
notation: 369

Other chemical components (coarse)
type: Concept
notation: 660

C14H10 (anthracene), in air and aerosol
type: Concept
notation: 337

C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in wet precipitation
type: Concept
notation: 383

C3H3F5 (1,1,1,3,3-Pentafluoropropane, HFC-245fa)
type: Concept
notation: 558

Gust Speed
type: Concept
notation: 305

C18H12 (Benz(a)anthracene), in total precipitation
type: Concept
notation: 351

Obscuration type
type: Concept
notation: 526

Direct solar radiation
type: Concept
notation: 572

Turbulence
type: Concept
notation: 249

Fluoride (F-)
type: Concept
notation: 540

Thorium (Th), PM2.5
type: Concept
notation: 715

Electric conductivity
type: Concept
notation: 295

Characteristic of pressure tendency
type: Concept
notation: 217

Total column ozone
type: Concept
notation: 263

C2H6S (dimethylsulfide, DMS)
type: Concept
notation: 438

C8H10 (m-xylene)
type: Concept
notation: 484

Major inorganic components (fine)
type: Concept
notation: 659

C4H8O (butanal isomers)
type: Concept
notation: 452

Aluminium (Al), PM2.5
type: Concept
notation: 673

C3F8 (octafluoropropane, PFC-218)
type: Concept
notation: 420

Observed variable - measurand (atmosphere)
type: Collection
member: Cadmium (Cd), PM1
member: C9H12 (1,2,4-trimethylbenzene)
member: Thallium (Tl), PM2.5
member: Integrated water vapour
member: Lithium (Li), PM2.5
member: C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in air
member: Height of cloud top
member: Nitrate (NO3-), PM10
member: Chloride (Cl-), PM1
member: H2O (as a chemical species)
member: C3H6 (propene)
member: Light scattering coefficient, total aerosol
member: C14H10 (anthracene), in air
member: Global solar radiation (upwelling)
member: C5H10 (sum of 1-pentene & 2-methyl-2-butene)
member: UV-B radiation
member: C2H3O5N (peroxyacetylnitrate, PAN)
member: n-C7H16 (n-heptane)
member: HF (hydrofluoric acid)
member: Magnesium (Mg++), PM10
member: CCN concentration at single supersaturation
member: Special phenomena
member: Occurrence of precipitation during last period (yes/no)
member: C5H14 (2,3-dimethylbutane)
member: C16H10 (pyrene), in air and aerosol
member: Wind (surface wind direction and speed, horizontal) - deprecated
member: CH3CCl3 (1,1,1-trichloroethane)
member: C3HF7 (1,1,1,2,3,3,3-Heptafluoropropane, HFC-227ea)
member: Antimony (Sb), PM2.5
member: C6Hn (n={14, 12}; sum of 2,3-dimethylbutane & methylcyclopentane
member: Cerium (Ce), total aerosol
member: Nickel (Ni), total aerosol
member: CH3Cl (methylchloride)
member: C12H8Cl6 (aldrin), in air
member: Uranium (U), total aerosol
member: NMHC
member: Hydrogen ion (H+) or pH
member: Lithometeor type
member: Major chemical components (size fractionated)
member: Mercury (Hg)
member: C18H12 (Benz(a)anthracene), in precipitation
member: Aerosol Absorption Optical Depth
member: Type of cloud
member: C8H10 (m-xylene)
member: Barium (Ba), total aerosol
member: Selenium (Se), total aerosol
member: C2H2 (ethyne, acetylene)
member: C4H6O (but-3-en-2-one, methylvinylketone)
member: Long-wave radiation (downwelling)
member: Lanthanum (La), total aerosol
member: C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in aerosol
member: Past weather
member: Height of cloud base
member: NOx
member: C2H3O2- (CH3COO-, acetate), in aerosol
member: Light backscattering coefficient, total aerosol
member: Diffuse solar radiation
member: Beryllium [Be-7]
member: C5H10 (2-methyl-2-butene)
member: C14H10 (anthracene), in air and aerosol
member: C2F6 (hexafluoroethane, PFC-116)
member: i-C7H16 (2-methylhexane, isoheptane)
member: ClO (chlorine monoxide)
member: Calcium (Ca++), PM10
member: Mass concentration (total aerosol) or Mass TSP
member: Ammonium nitrate (NH4NO3), total aerosol
member: Amount of precipitation
member: Aerosol volcanic ash (mass concentration)
member: C5H10O (pentanal, valeraldehyde)
member: C14H10 (phenanthrene), in air and aerosol
member: CCl2F2 (dichlorodifluoromethane, CFC-12)
member: Extreme temperature (min, max) (at specified distance from reference surface)
member: Phosphate (PO4---)
member: C2HF5 (pentafluoroethane, HFC-125)
member: C6H6 (benzene)
member: Titanium (Ti), total aerosol
member: UV Multiband
member: Manganese (Mn), total aerosol
member: Cerium (Ce), PM2.5

Cadmium (Cd), PM1
type: Concept
notation: 683

Integrated water vapour
type: Concept
notation: 252

Lithium (Li), PM2.5
type: Concept
notation: 699

H2O (as a chemical species)
type: Concept
notation: 206

Global solar radiation (upwelling)
type: Concept
notation: 574

UV-B radiation
type: Concept
notation: 273

C2H3O5N (peroxyacetylnitrate, PAN)
type: Concept
notation: 391

HF (hydrofluoric acid)
type: Concept
notation: 289

Magnesium (Mg++), PM10
type: Concept
notation: 635

CCN concentration at single supersaturation
type: Concept
notation: 411

Special phenomena
type: Concept
notation: 56

C16H10 (pyrene), in air and aerosol
type: Concept
notation: 345

Wind (surface wind direction and speed, horizontal) - deprecated
type: Concept
notation: 309

CH3CCl3 (1,1,1-trichloroethane)
type: Concept
notation: 595

Antimony (Sb), PM2.5
type: Concept
notation: 675

C12H8Cl6 (aldrin), in air
type: Concept
notation: 376

Uranium (U), total aerosol
type: Concept
notation: 720

NMHC
type: Concept
notation: 494

Major chemical components (size fractionated)
type: Concept
notation: 656

C18H12 (Benz(a)anthracene), in precipitation
type: Concept
notation: 350

Type of cloud
type: Concept
notation: 550

Selenium (Se), total aerosol
type: Concept
notation: 710

C4H6O (but-3-en-2-one, methylvinylketone)
type: Concept
notation: 448

Long-wave radiation (downwelling)
type: Concept
notation: 566

Lanthanum (La), total aerosol
type: Concept
notation: 696

Past weather
type: Concept
notation: 265

Height of cloud base
type: Concept
notation: 531

Light backscattering coefficient, total aerosol
type: Concept
notation: 321

Diffuse solar radiation
type: Concept
notation: 571

Beryllium [Be-7]
type: Concept
notation: 219

C2F6 (hexafluoroethane, PFC-116)
type: Concept
notation: 419

ClO (chlorine monoxide)
type: Concept
notation: 286

Calcium (Ca++), PM10
type: Concept
notation: 632

Mass concentration (total aerosol) or Mass TSP
type: Concept
notation: 368

Ammonium nitrate (NH4NO3), total aerosol
type: Concept
notation: 648

Aerosol volcanic ash (mass concentration)
type: Concept
notation: 728

C5H10O (pentanal, valeraldehyde)
type: Concept
notation: 460

C14H10 (phenanthrene), in air and aerosol
type: Concept
notation: 342

Phosphate (PO4---)
type: Concept
notation: 542

Titanium (Ti), total aerosol
type: Concept
notation: 672

UV Multiband
type: Concept
notation: 358

Cerium (Ce), PM2.5
type: Concept
notation: 688

Extinction coefficient
type: Concept
notation: 521

Lightning discharge energy
type: Concept
notation: 257

Nitrite (NO2-), total aerosol
type: Concept
notation: 653

Iron (Fe)
type: Concept
notation: 603

CHO2- (HCOO-, formate), in aerosol
type: Concept
notation: 669

C7H6O (benzene carbaldehyde)
type: Concept
notation: 481

Acidity-Alkalinity, total aerosol
type: Concept
notation: 579

Surface ozone
type: Concept
notation: 262

C6Cl6 (hexachlorobenzene, HCB), in air
type: Concept
notation: 380

CH2Cl2 (dichloromethane)
type: Concept
notation: 278

Elemental carbon, PM1
type: Concept
notation: 624

PSC occurrence
type: Concept
notation: 188

C13H10 (9H-fluorene, fluorene), in air
type: Concept
notation: 334

Hygroscopic growth factor, 50 μm equivalent
type: Concept
notation: 416

Rubidium (Rb), PM2.5
type: Concept
notation: 708

Ammonium (NH4+), PM10
type: Concept
notation: 645

i-C5H12 (2-methylbutane, iso-pentane)
type: Concept
notation: 499

C6H14 (3-methylpentane)
type: Concept
notation: 473

C2H6 (ethane)
type: Concept
notation: 437

C2H4F2 (1,1-difluoroethane, HFC-152a)
type: Concept
notation: 555

Cadmium (Cd), PM2.5
type: Concept
notation: 685

Object wetness duration
type: Concept
notation: 254

Chromium (Cr)
type: Concept
notation: 600

C2H3Cl2F (1,1-dichloro-1-fluoroethane, HCFC-141b)
type: Concept
notation: 534

Chloride (Cl-), PM2.5
type: Concept
notation: 616

Upper wind (X, Y components, horizontal)
type: Concept
notation: 310

Aerological soundings
type: Concept
notation: 37

Acetate (CH3COO-)
type: Concept
notation: 576

C2Cl4 (tetrachloroethene)
type: Concept
notation: 275

Sulphate (SO4=), total, PM10
type: Concept
notation: 621

Magnesium (Mg++), total aerosol
type: Concept
notation: 637

Icing potential
type: Concept
notation: 331

Runway visual range
type: Concept
notation: 229

C5H8 (cyclopentene)
type: Concept
notation: 465

C18H12 (Benz(a)anthracene), in aerosol
type: Concept
notation: 347

CS2 (Carbon disulfide)
type: Concept
notation: 429

Aluminium (Al)
type: Concept
notation: 597

Visibility
type: Concept
notation: 230

c-C5H10 (cis-2-pentene)
type: Concept
notation: 496

Major inorganic components (coarse)
type: Concept
notation: 658

CO2 [C-14]
type: Concept
notation: 220

Vanadium (V)
type: Concept
notation: 608

C6H12O (hexanal isomers)
type: Concept
notation: 470

inapplicable
type: Concept
notation: inapplicable

Type of low clouds
type: Concept
notation: 552

C8H10 (p,m-xylene)
type: Concept
notation: 486

Strontium (Sr), total aerosol
type: Concept
notation: 712

Background luminance
type: Concept
notation: 267

C3H4O2 (2-oxopropanal, methylglyoxal)
type: Concept
notation: 441

Light scattering coefficient, PM10
type: Concept
notation: 323

C2Cl2F4 (1,2-dichlorotetrafluoroethane, CFC-114)
type: Concept
notation: 589

Ammonia (NH3)
type: Concept
notation: 390

n-C5H12 (n-pentane)
type: Concept
notation: 502

Intensity of precipitation
type: Concept
notation: 212

C5H12 (2,2-dimethylpropane)
type: Concept
notation: 462

C14H10 (phenanthrene), in total precipitation
type: Concept
notation: 344

C6Hn (n={14, 12}; sum of 2,2-dimethylbutane & methylcyclopentane
type: Concept
notation: 478

Nickel (Ni), PM10
type: Concept
notation: 704

Cloud amount
type: Concept
notation: 179

Hydrometeor type
type: Concept
notation: 523

Lightning discharge rates
type: Concept
notation: 259

Manganese (Mn)
type: Concept
notation: 605

Chloride (Cl-)
type: Concept
notation: 539

C8H10 (ethylbenzene)
type: Concept
notation: 483

Lightning distance from station
type: Concept
notation: 433

Long-wave radiation (direction unspecified)
type: Concept
notation: 565

Horizontal wind speed at specified distance from reference surface
type: Concept
notation: 12006

NO2
type: Concept
notation: 396

C2H3O2- (CH3COO-, acetate), PM1
type: Concept
notation: 662

Total carbon (coarse), PM10
type: Concept
notation: 626

C5H10 (2-methyl-1-butene)
type: Concept
notation: 454

C14H10 (anthracene), in aerosol
type: Concept
notation: 336

Hygroscopic growth factor, total aerosol
type: Concept
notation: 418

Surface albedo
type: Concept
notation: 271

Aerosol dust concentration (mass)
type: Concept
notation: 727

Dew-point temperature (at specified distance from reference surface)
type: Concept
notation: 225

C6H14 (sum of methylpentanes)
type: Concept
notation: 475

Manganese (Mn), PM10
type: Concept
notation: 701

Tin (Sn), PM2.5
type: Concept
notation: 717

C2H3F3 (1,1,1-trifluoroethane, HCFC-143a)
type: Concept
notation: 536

Fluoride (F-), total aerosol
type: Concept
notation: 618

SO2
type: Concept
notation: 430

Vertical distribution of properties
type: Concept
notation: 326

Atmospheric density
type: Concept
notation: 39

C4H6 (1,3-butadiene, butadiene)
type: Concept
notation: 446

Effective radius of cloud hydrometeors
type: Concept
notation: 183

HCN (formonitrile, hydrogen cyanide)
type: Concept
notation: 393

Optical depth of fog
type: Concept
notation: 507

Potassium (K+), PM2.5
type: Concept
notation: 639

N2O
type: Concept
notation: 201

C4H8O (butan-2-one, methylethylketone)
type: Concept
notation: 451

Potassium (K+)
type: Concept
notation: 547

C5Hn (n={12, 10}; sum of n-pentane & cyclopentane)
type: Concept
notation: 467

C18H12 (Benz(a)anthracene), in air and aerosol
type: Concept
notation: 349

Arsenic (As), PM10
type: Concept
notation: 677

Mass concentration (coarse) or Mass PM10
type: Concept
notation: 364

CO
type: Concept
notation: 284

Transport calculations (e.g., trajectories)
type: Concept
notation: 248

Sulphur (S)
type: Concept
notation: 302

Lead [Pb-210]
type: Concept
notation: 222

Light absorption coefficient, total aerosol
type: Concept
notation: 318

Ammonium (NH4+)
type: Concept
notation: 568

C9H12 (1,3,5-trimethylbenzene)
type: Concept
notation: 488

Thallium (Tl), total aerosol
type: Concept
notation: 714

C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in wet precipitation
type: Concept
notation: 385

Height of inversion
type: Concept
notation: 533

Nitrate (NO3-), PM2.5
type: Concept
notation: 651

C3H6O (acetone, propanone)
type: Concept
notation: 443

C14H10 (phenanthrene), PM10
type: Concept
notation: 339

Cloud cover
type: Concept
notation: 180

t-C4H8 (trans-2-butene)
type: Concept
notation: 504

Rate of ice accretion
type: Concept
notation: 214

C5H8 (2-methyl-1,3-butadiene, isoprene)
type: Concept
notation: 464

Sulphate (SO4=), total
type: Concept
notation: 544

Aerosol column burden (mass density)
type: Concept
notation: 361

CH3I (methyliodide)
type: Concept
notation: 281

Sodium (Na+), PM10
type: Concept
notation: 641

C12H8Cl6 (aldrin), in air and aerosol
type: Concept
notation: 377

Meteorological Optical Range
type: Concept
notation: 525

Nickel (Ni)
type: Concept
notation: 607

Aerosol Extinction Coefficient
type: Concept
notation: 315

Bismuth (Bi), PM2.5
type: Concept
notation: 681

C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in air
type: Concept
notation: 382

NOy
type: Concept
notation: 398

C2O4= (oxalate, ethanedioate), PM1
type: Concept
notation: 664

C5H10 (3-methyl-1-butene)
type: Concept
notation: 456

Duration of precipitation
type: Concept
notation: 211

Wind (Z component, vertical)
type: Concept
notation: 307

Temperature profile
type: Concept
notation: 227

CCl3F (trichlorofluoromethane, CFC-11)
type: Concept
notation: 593

C3H2F6 (1,1,1,2,3,3-hexafluoropropane, HFC-236fa)
type: Concept
notation: 557

Cloud liquid water (CLW, total column)
type: Concept
notation: 374

CH3CN (acetonitrile)
type: Concept
notation: 492

Acidity-Alkalinity
type: Concept
notation: 294

Potassium (K+), total aerosol
type: Concept
notation: 640

Sum of ammonia (NH3) and ammonium (NH4+), in air and aerosol
type: Concept
notation: 654

Bromide (Br-)
type: Concept
notation: 538

Lightning direction from station
type: Concept
notation: 432

Cloud ice (total column)
type: Concept
notation: 328

Iron (Fe), total aerosol
type: Concept
notation: 694

NO
type: Concept
notation: 395

Short-wave cloud reflectance
type: Concept
notation: 509

Uranium (U), PM2.5
type: Concept
notation: 719

SF6
type: Concept
notation: 203

C6H12 (methylcyclopentane)
type: Concept
notation: 469

Rubidium (Rb), total aerosol
type: Concept
notation: 709

Mass concentration (medium), PM2.5
type: Concept
notation: 366

C14H10 (phenanthrene), in aerosol
type: Concept
notation: 340

Direction of cloud movement
type: Concept
notation: 304

C2Cl3F3 (1,1,2-trichloro-1,2,2-trifluoroethane, CFC-113)
type: Concept
notation: 590

CO2 [O-18]
type: Concept
notation: 196

Carbonaceous-organic material (coarse), PM10
type: Concept
notation: 670

Cadmium (Cd), PM2.5 thru PM10
type: Concept
notation: 686

CH3O3S- (methanesulphonate), PM1
type: Concept
notation: 667

CH2F2 (difluoromethane, HFC-32)
type: Concept
notation: 561

Lightning density cloud-to-ground
type: Concept
notation: 12002

Cobalt (Co), total aerosol
type: Concept
notation: 691

C5H10 (sum of pentenes)
type: Concept
notation: 459

Lightning discharge type (cloud to cloud, cloud to surface)
type: Concept
notation: 260

C2HCl3 (trichloroethene)
type: Concept
notation: 276

Sulphate (SO4=), total, PM2.5
type: Concept
notation: 622

Cloud optical depth
type: Concept
notation: 506

CBrClF2 (Halon 1211)
type: Concept
notation: 332

Hygroscopic growth factor, 165 μm equivalent
type: Concept
notation: 414

Atmospheric pressure
type: Concept
notation: 216

unknown
type: Concept
notation: unknown

Phosphorous (P), PM2.5
type: Concept
notation: 706

Arsenic (As)
type: Concept
notation: 598

Sodium (Na+), total aerosol
type: Concept
notation: 643

i-C4H10 (2-methylpropane, iso-butane)
type: Concept
notation: 497

C12H8Cl6 (aldrin), in wet precipitation
type: Concept
notation: 379

Zinc (Zn), PM2.5
type: Concept
notation: 723

CH4 [C-13]
type: Concept
notation: 193

C2H2O2 (oxaldehyde, ethanedial)
type: Concept
notation: 435

Light absorption coefficient, PM10
type: Concept
notation: 317

Type of middle clouds
type: Concept
notation: 553