Air Quality

The Tomorrow.io REST Weather API provides the following information:

Field

Values (Metric, Imperial)

Availability

particulateMatter25

The concentration of atmospheric particulate matter (PM) that have a diameter of fewer than 2.5 micrometers.

μg/m^3 (microgram per cubic meter)
μg/ft^3

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

pm25pm25

pm25pm25

particulateMatter10

The concentration of atmospheric particulate matter (PM) that has a diameter of fewer than 10 micrometers

μg/m^3 (microgram per cubic meter)
μg/ft^3

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

pm10pm10

pm10pm10

pollutantO3

The concentration of surface Ozone (O3)

ppb (parts per billion)

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

o3o3

o3o3

pollutantNO2

The concentration of surface Nitrogen Dioxide (NO2)

ppb (parts per billion)

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

no2no2

no2no2

pollutantCO

The concentration of surface Carbon Monoxide (CO)

ppm (parts per million)

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

coco

coco

pollutantSO2

The concentration of surface Sulfur Dioxide (SO2)

ppb (parts per billion)

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

so2so2

so2so2

mepIndex

The air quality index per China MEP standard

0-301

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

cn_realtime_aqicn_realtime_aqi

cn_realtime_aqicn_realtime_aqi

mepPrimaryPollutant

The primary pollutant per China MEP standard

0: PM2.5
1: PM10
2: O3
3: NO2
4: CO
5: SO2

F: [-7 days, +108 hours]
I: T M R
A: LAND
S: -

mepHealthConcern

The concern level based on China MEP standard

0: Good (0-50)
1: Moderate (51-100)
2: Unhealthy for Sensitive Groups (101-150)
3: Unhealthy (151-200)
4: Very Unhealthy (201-300)
5: Hazardous (>301)

F: [-7 days, +108 hours]
I: T R
A: LAND
S: ∧ ∨ ~

epaIndex

The air quality index per US EPA standard

0-301

F: [-7 days, +108 hours]
I: T I M R
A: LAND
S: ∧ ∨ ~

us_nowcast_aqius_nowcast_aqi

us_nowcast_aqius_nowcast_aqi

epaPrimaryPollutant

The primary pollutant per US EPA standard

0: PM2.5
1: PM10
2: O3
3: NO2
4: CO
5: SO2

F: [-7 days, +108 hours]
I: T M R
A: LAND
S: -

epaHealthConcern

The concern level based on US EPA standard

0: Good (0-50)
1: Moderate (51-100)
2: Unhealthy for Sensitive Groups (101-150)
3: Unhealthy (151-200)
4: Very Unhealthy (201-300)
5: Hazardous (>301)

F: [-7 days, +108 hours]
I: T R
A: LAND
S: ∧ ∨ ~