Air Quality

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

Field

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, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`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, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`pollutantO3` The concentration of surface Ozone (O3)	ppb (parts per billion)	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`pollutantNO2` The concentration of surface Nitrogen Dioxide (NO2)	ppb (parts per billion)	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`pollutantCO` The concentration of surface Carbon Monoxide (CO)	ppm (parts per million)	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`pollutantSO2` The concentration of surface Sulfur Dioxide (SO2)	ppb (parts per billion)	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`mepIndex` The air quality index per China MEP standard	0-301	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P :-
`mepPrimaryPollutant` The primary pollutant per China MEP standard	0: PM2.5 1: PM10 2: O3 3: NO2 4: CO 5: SO2	F: [-7 days, +100 hours] I: T M R A: WW S: - P: -
`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, +100 hours] I: T R A: WW S: ∧ ∨ ~ P: -
`epaIndex` The air quality index per US EPA standard	0-301	F: [-7 days, +100 hours] I: T I M R A: WW S: ∧ ∨ ~ P: -
`epaPrimaryPollutant` The primary pollutant per US EPA standard	0: PM2.5 1: PM10 2: O3 3: NO2 4: CO 5: SO2	F: [-7 days, +100 hours] I: T M R A: WW S: - P: -
`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, +100 hours] I: T R A: WW S: ∧ ∨ ~ P: -
`wildfireSmokeIndex` The Tomorrow.io wildfire smoke index conveys risk that an area may be exposed to elevated particulate matter concentrations (PM2.5) from nearby fires. The index focuses on areas in the direct path of the initial smoke plume, but does not include risk from background smoke that accumulates over the course of several days.	0: No risk. 1: Minor risk* - Concentrations of particulate matter may increase due to nearby wildfires, but should be of little risk to the population. 2: Moderate smoke concentrations possible* - This area may experience increases in PM2.5 concentrations that could be risky to those who are unusually sensitive to pollution. 3: Significant smoke concentrations possible* - Particulate matter concentrations could be significant enough that those at high risk could have adverse health affects. 4: Major smoke concentrations probable* - This area is at high risk of smoke concentrations that could have adverse affects for the general population. Those in unusually sensitive groups should take precautions. 5: Extreme smoke concentrations likely* - PM2.5 concentrations are likely to be high enough that everyone is at risk for health effects due to the poor air quality.	F: [Now, +48 hours] I: T M R A: WW S: ∧ ∨ P: -

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, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -
pm25

pm25

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, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -
pm10

pm10

pollutantO3

The concentration of surface Ozone (O3)

ppb (parts per billion)

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -

pollutantNO2

The concentration of surface Nitrogen Dioxide (NO2)

ppb (parts per billion)

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -
no2

no2

pollutantCO

The concentration of surface Carbon Monoxide (CO)

ppm (parts per million)

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -

pollutantSO2

The concentration of surface Sulfur Dioxide (SO2)

ppb (parts per billion)

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -
so2

so2

mepIndex

The air quality index per China MEP standard

0-301

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P :-
cn_realtime_aqi

cn_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, +100 hours]
I: T M R
A: WW
S: -
P: -

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, +100 hours]
I: T R
A: WW
S: ∧ ∨ ~
P: -

epaIndex

The air quality index per US EPA standard

0-301

F: [-7 days, +100 hours]
I: T I M R
A: WW
S: ∧ ∨ ~
P: -
us_nowcast_aqi

us_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, +100 hours]
I: T M R
A: WW
S: -
P: -

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, +100 hours]
I: T R
A: WW
S: ∧ ∨ ~
P: -

wildfireSmokeIndex

The Tomorrow.io wildfire smoke index conveys risk that an area may be exposed to elevated particulate matter concentrations (PM2.5) from nearby fires. The index focuses on areas in the direct path of the initial smoke plume, but does not include risk from background smoke that accumulates over the course of several days.

0: No risk.

*1: Minor risk** - Concentrations of particulate matter may increase due to nearby wildfires, but should be of little risk to the population.
*2: Moderate smoke concentrations possible** - This area may experience increases in PM2.5 concentrations that could be risky to those who are unusually sensitive to pollution.
*3: Significant smoke concentrations possible** - Particulate matter concentrations could be significant enough that those at high risk could have adverse health affects.
*4: Major smoke concentrations probable** - This area is at high risk of smoke concentrations that could have adverse affects for the general population. Those in unusually sensitive groups should take precautions.
*5: Extreme smoke concentrations likely** - PM2.5 concentrations are likely to be high enough that everyone is at risk for health effects due to the poor air quality.

F: [Now, +48 hours]
I: T M R
A: WW
S: ∧ ∨
P: -