Method: forecast.lookup

Returns up to 5 days of daily pollen information in more than 65 countries, up to 1km resolution.

HTTP request

GET https://pollen.googleapis.com/v1/forecast:lookup

The URL uses gRPC Transcoding syntax.

Query parameters

Parameters
location

object (LatLng)

Required. The longitude and latitude from which the API searches for pollen forecast data.
days

integer

Required. A number that indicates how many forecast days to request (minimum value 1, maximum value is 5).
pageSize

integer

Optional. The maximum number of daily info records to return per page. The default and max value is 5 (5 days of data).
pageToken

string

Optional. A page token received from a previous daily call. It is used to retrieve the subsequent page.

Note that when providing a value for the page token all other request parameters provided must match the previous call that provided the page token.
languageCode

string

Optional. Allows the client to choose the language for the response. If data cannot be provided for that language the API uses the closest match. Allowed values rely on the IETF BCP-47 standard. Default value is "en".
plantsDescription

boolean

Optional. Contains general information about plants, including details on their seasonality, special shapes and colors, information about allergic cross-reactions, and plant photos.

Request body

The request body must be empty.

Response body

If successful, the response body contains data with the following structure:

JSON representation 
{
  "regionCode": string,
  "dailyInfo": [
    {
      object (DayInfo)
    }
  ],
  "nextPageToken": string
}
Fields
regionCode

string

The ISO_3166-1 alpha-2 code of the country/region corresponding to the location provided in the request. This field might be omitted from the response if the location provided in the request resides in a disputed territory.
dailyInfo[]

object (DayInfo)

Required. This object contains the daily forecast information for each day requested.
nextPageToken

string

Optional. The token to retrieve the next page.

Authorization scopes

Requires the following OAuth scope:

  • https://www.googleapis.com/auth/cloud-platform

For more information, see the OAuth 2.0 Overview.

LatLng

An object that represents a latitude/longitude pair. This is expressed as a pair of doubles to represent degrees latitude and degrees longitude. Unless specified otherwise, this object must conform to the WGS84 standard. Values must be within normalized ranges.

JSON representation 
{
  "latitude": number,
  "longitude": number
}
Fields
latitude

number

The latitude in degrees. It must be in the range [-90.0, +90.0].
longitude

number

The longitude in degrees. It must be in the range [-180.0, +180.0].

DayInfo

This object contains the daily forecast information for each day requested.

JSON representation 
{
  "date": {
    object (Date)
  },
  "pollenTypeInfo": [
    {
      object (PollenTypeInfo)
    }
  ],
  "plantInfo": [
    {
      object (PlantInfo)
    }
  ]
}
Fields
date

object (Date)

The date in UTC at which the pollen forecast data is represented.
pollenTypeInfo[]

object (PollenTypeInfo)

This list will include (up to) three pollen types (grass, weed, tree) affecting the location specified in the request.
plantInfo[]

object (PlantInfo)

This list will include (up to) 15 pollen species affecting the location specified in the request.

Date

Represents a whole or partial calendar date, such as a birthday. The time of day and time zone are either specified elsewhere or are insignificant. The date is relative to the Gregorian Calendar. This can represent one of the following:

  • A full date, with non-zero year, month, and day values.
  • A month and day, with a zero year (for example, an anniversary).
  • A year on its own, with a zero month and a zero day.
  • A year and month, with a zero day (for example, a credit card expiration date).

Related types:

JSON representation 
{
  "year": integer,
  "month": integer,
  "day": integer
}
Fields
year

integer

Year of the date. Must be from 1 to 9999, or 0 to specify a date without a year.
month

integer

Month of a year. Must be from 1 to 12, or 0 to specify a year without a month and day.
day

integer

Day of a month. Must be from 1 to 31 and valid for the year and month, or 0 to specify a year by itself or a year and month where the day isn't significant.

PollenTypeInfo

This object contains the pollen type index and health recommendation information on specific pollen type.

JSON representation 
{
  "code": enum (PollenType),
  "displayName": string,
  "indexInfo": {
    object (IndexInfo)
  },
  "healthRecommendations": [
    string
  ],
  "inSeason": boolean
}
Fields
code

enum (PollenType)

The pollen type's code name. For example: "GRASS"
displayName

string

A human readable representation of the pollen type name. Example: "Grass"
indexInfo

object (IndexInfo)

Contains the Universal Pollen Index (UPI) data for the pollen type.
healthRecommendations[]

string

Textual list of explanations, related to health insights based on the current pollen levels.
inSeason

boolean

Indication whether the plant is in season or not.

PollenType

Pollen Type Code

Enums
POLLEN_TYPE_UNSPECIFIED Unspecified plant type.
GRASS Grass pollen type.
TREE Tree pollen type.
WEED Weed pollen type.

IndexInfo

This object contains data representing specific pollen index value, category and description.

JSON representation 
{
  "code": enum (Index),
  "displayName": string,
  "category": string,
  "indexDescription": string,
  "color": {
    object (Color)
  },
  "value": integer
}
Fields
code

enum (Index)

The index's code. This field represents the index for programming purposes by using snake cases instead of spaces. Example: "UPI".
displayName

string

A human readable representation of the index name. Example: "Universal Pollen Index".
category

string

Text classification of index numerical score interpretation. The index consists of six categories:

  • 0: "None"
  • 1: "Very low"
  • 2: "Low"
  • 3: "Moderate"
  • 4: "High"
  • 5: "Very high
indexDescription

string

Textual explanation of current index level.
color

object (Color)

The color used to represent the Pollen Index numeric score.
value

integer

The index's numeric score. Numeric range is between 0 and 5.

Index

Index Code

Enums
INDEX_UNSPECIFIED Unspecified index.
UPI Universal Pollen Index.

Color

Represents a color in the RGBA color space. This representation is designed for simplicity of conversion to and from color representations in various languages over compactness. For example, the fields of this representation can be trivially provided to the constructor of java.awt.Color in Java; it can also be trivially provided to UIColor's +colorWithRed:green:blue:alpha method in iOS; and, with just a little work, it can be easily formatted into a CSS rgba() string in JavaScript.

This reference page doesn't have information about the absolute color space that should be used to interpret the RGB value—for example, sRGB, Adobe RGB, DCI-P3, and BT.2020. By default, applications should assume the sRGB color space.

When color equality needs to be decided, implementations, unless documented otherwise, treat two colors as equal if all their red, green, blue, and alpha values each differ by at most 1e-5.

Example (Java):

 import com.google.type.Color;

 // ...
 public static java.awt.Color fromProto(Color protocolor) {
   float alpha = protocolor.hasAlpha()
       ? protocolor.getAlpha().getValue()
       : 1.0;

   return new java.awt.Color(
       protocolor.getRed(),
       protocolor.getGreen(),
       protocolor.getBlue(),
       alpha);
 }

 public static Color toProto(java.awt.Color color) {
   float red = (float) color.getRed();
   float green = (float) color.getGreen();
   float blue = (float) color.getBlue();
   float denominator = 255.0;
   Color.Builder resultBuilder =
       Color
           .newBuilder()
           .setRed(red / denominator)
           .setGreen(green / denominator)
           .setBlue(blue / denominator);
   int alpha = color.getAlpha();
   if (alpha != 255) {
     result.setAlpha(
         FloatValue
             .newBuilder()
             .setValue(((float) alpha) / denominator)
             .build());
   }
   return resultBuilder.build();
 }
 // ...

Example (iOS / Obj-C):

 // ...
 static UIColor* fromProto(Color* protocolor) {
    float red = [protocolor red];
    float green = [protocolor green];
    float blue = [protocolor blue];
    FloatValue* alpha_wrapper = [protocolor alpha];
    float alpha = 1.0;
    if (alpha_wrapper != nil) {
      alpha = [alpha_wrapper value];
    }
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
 }

 static Color* toProto(UIColor* color) {
     CGFloat red, green, blue, alpha;
     if (![color getRed:&red green:&green blue:&blue alpha:&alpha]) {
       return nil;
     }
     Color* result = [[Color alloc] init];
     [result setRed:red];
     [result setGreen:green];
     [result setBlue:blue];
     if (alpha <= 0.9999) {
       [result setAlpha:floatWrapperWithValue(alpha)];
     }
     [result autorelease];
     return result;
}
// ...

Example (JavaScript):

// ...

var protoToCssColor = function(rgb_color) {
   var redFrac = rgb_color.red || 0.0;
   var greenFrac = rgb_color.green || 0.0;
   var blueFrac = rgb_color.blue || 0.0;
   var red = Math.floor(redFrac * 255);
   var green = Math.floor(greenFrac * 255);
   var blue = Math.floor(blueFrac * 255);

   if (!('alpha' in rgb_color)) {
      return rgbToCssColor(red, green, blue);
   }

   var alphaFrac = rgb_color.alpha.value || 0.0;
   var rgbParams = [red, green, blue].join(',');
   return ['rgba(', rgbParams, ',', alphaFrac, ')'].join('');
};

var rgbToCssColor = function(red, green, blue) {
  var rgbNumber = new Number((red << 16) | (green << 8) | blue);
  var hexString = rgbNumber.toString(16);
  var missingZeros = 6 - hexString.length;
  var resultBuilder = ['#'];
  for (var i = 0; i < missingZeros; i++) {
     resultBuilder.push('0');
  }
  resultBuilder.push(hexString);
  return resultBuilder.join('');
};

// ...
JSON representation 
{
  "red": number,
  "green": number,
  "blue": number,
  "alpha": number
}
Fields
red

number

The amount of red in the color as a value in the interval [0, 1].
green

number

The amount of green in the color as a value in the interval [0, 1].
blue

number

The amount of blue in the color as a value in the interval [0, 1].
alpha

number

The fraction of this color that should be applied to the pixel. That is, the final pixel color is defined by the equation:

pixel color = alpha * (this color) + (1.0 - alpha) * (background color)

This means that a value of 1.0 corresponds to a solid color, whereas a value of 0.0 corresponds to a completely transparent color. This uses a wrapper message rather than a simple float scalar so that it is possible to distinguish between a default value and the value being unset. If omitted, this color object is rendered as a solid color (as if the alpha value had been explicitly given a value of 1.0).

PlantInfo

This object contains the daily information on specific plant.

JSON representation 
{
  "code": enum (Plant),
  "displayName": string,
  "indexInfo": {
    object (IndexInfo)
  },
  "plantDescription": {
    object (PlantDescription)
  },
  "inSeason": boolean
}
Fields
code

enum (Plant)

The plant code name. For example: "COTTONWOOD". A list of all available codes could be found here.
displayName

string

A human readable representation of the plant name. Example: “Cottonwood".
indexInfo

object (IndexInfo)

This object contains data representing specific pollen index value, category and description.
plantDescription

object (PlantDescription)

Contains general information about plants, including details on their seasonality, special shapes and colors, information about allergic cross-reactions, and plant photos.
inSeason

boolean

Indication of either the plant is in season or not.

Plant

Lists available plants with varying availability across locations.

Enums
PLANT_UNSPECIFIED Unspecified plant code.
ALDER Alder is classified as a tree pollen type.
ASH Ash is classified as a tree pollen type.
BIRCH Birch is classified as a tree pollen type.
COTTONWOOD Cottonwood is classified as a tree pollen type.
ELM Elm is classified as a tree pollen type.
MAPLE Maple is classified as a tree pollen type.
OLIVE Olive is classified as a tree pollen type.
JUNIPER Juniper is classified as a tree pollen type.
OAK Oak is classified as a tree pollen type.
PINE Pine is classified as a tree pollen type.
CYPRESS_PINE Cypress pine is classified as a tree pollen type.
HAZEL Hazel is classified as a tree pollen type.
GRAMINALES Graminales is classified as a grass pollen type.
RAGWEED Ragweed is classified as a weed pollen type.
MUGWORT Mugwort is classified as a weed pollen type.

PlantDescription

Contains general information about plants, including details on their seasonality, special shapes and colors, information about allergic cross-reactions, and plant photos.

JSON representation 
{
  "type": enum (PollenType),
  "family": string,
  "season": string,
  "specialColors": string,
  "specialShapes": string,
  "crossReaction": string,
  "picture": string,
  "pictureCloseup": string
}
Fields
type

enum (PollenType)

The plant's pollen type. For example: "GRASS". A list of all available codes could be found here.
family

string

A human readable representation of the plant family name. Example: "Betulaceae (the Birch family)".
season

string

Textual list of explanations of seasons where the pollen is active. Example: "Late winter, spring".
specialColors

string

Textual description of the plants' colors of leaves, bark, flowers or seeds that helps identify the plant.
specialShapes

string

Textual description of the plants' shapes of leaves, bark, flowers or seeds that helps identify the plant.
crossReaction

string

Textual description of pollen cross reaction plants. Example: Alder, Hazel, Hornbeam, Beech, Willow, and Oak pollen.
picture

string

Link to the picture of the plant.
pictureCloseup

string

Link to a closeup picture of the plant.