> For the complete documentation index, see [llms.txt](https://doc.duaer.com/zh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/zh/getting-started/greenhouse-gases.md).

# 在 Duaer 里查温室气体浓度

在 Duaer 里：美国海洋和大气管理局 GML：莫纳罗亚与全球二氧化碳、甲烷与氧化亚氮的月度浓度，含同比变化。一次成功查询用 1 额度。
## 能拿到什么

Duaer 数据市场里的「温室气体浓度」：美国海洋和大气管理局 GML：莫纳罗亚与全球二氧化碳、甲烷与氧化亚氮的月度浓度，含同比变化。查到结果时用 1 额度，结果交给数字组织的下一个节点。

从节点创建器选 Duaer 数据 → 温室气体浓度，或打开 [数据市场](/zh/getting-started/data-market.md)。相关：[气候预估](/zh/getting-started/climate-projection.md)、[英国电网碳强度](/zh/getting-started/grid-carbon.md)。

## 适合做什么

- 报告莫纳罗亚最新的二氧化碳读数。
- 绘制一年来甲烷浓度的上升。

## 在画布里检索

1. 打开节点创建器，选 Duaer 数据 → Greenhouse gas levels。
2. 填 Gas（co2、co2-global、ch4 或 n2o）。
3. Limit 默认 10，最大 20。执行。

查到结果才扣 1 额度；没有结果、输入有误或上游失败都不扣。

## 用 API 调用

- GET https://api.duaer.com/v1/data/greenhouse-gases?gas=co2
- Authorization: Bearer <Duaer key>

下方是与数据市场「复制技能」相同的英文技能，含参数、示例与返回字段。

## 调用技能（英文）

与数据市场「复制技能」一致。

```
---
name: duaer-greenhouse-gases
description: >-
  Duaer Greenhouse gas levels. NOAA GML: monthly CO2 at Mauna Loa and global CO2, methane, and nitrous oxide, with the change on a year earlier.
  One successful search uses 1 Duaer credit.
---

# Duaer Greenhouse gas levels

Duaer Greenhouse gas levels reads the NOAA Global Monitoring Laboratory monthly series, newest month first, with the trend and the change on a year earlier.

## When to use

- Report the latest CO2 reading at Mauna Loa.
- Chart the rise of methane over a year.

## When not to use

- Future climate projections. Use https://skills.duaer.com/climate-projection.md.
- Grid carbon intensity. Use https://skills.duaer.com/grid-carbon.md.

## Call

`GET https://api.duaer.com/v1/data/greenhouse-gases?gas=co2`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Get a Duaer key: https://skills.duaer.com/keys.md

## Parameters

Provide `gas`.

- `gas` — `co2` (Mauna Loa), `co2-global`, `ch4`, or `n2o`. Default co2.
- `limit` — Optional. Rows to return, from 1 to 20. Default 10.

## Examples

- `GET https://api.duaer.com/v1/data/greenhouse-gases?gas=co2` — monthly CO2 at Mauna Loa.
- `GET https://api.duaer.com/v1/data/greenhouse-gases?gas=ch4` — global methane.

## Result

The response is `{ "items": [...] }`. Each item has `source`, `title`, `url`, and `summary`, plus:

- `gas`, `month` — series and YYYY-MM.
- `value`, `unit` — monthly mean, in ppm or ppb.
- `trend` — seasonally adjusted value.
- `changeOnYear` — change on the same month a year earlier.

Fields without a value are left out.

## Credits

A search that returns at least one row uses 1 credit.
An empty search, a search that finds nothing, or a failed search uses 0.
Wrong input returns 400 with a message and uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

## Related

- https://skills.duaer.com/climate-projection.md — Duaer Climate projection
- https://skills.duaer.com/grid-carbon.md — Duaer GB grid carbon intensity

```
## Questions

### Duaer 的温室气体浓度检索扣多少额度？

查到结果时扣 1 额度；没有结果或出错不扣。

### Duaer 温室气体浓度的 trend 是什么？

是去除季节波动后的数值，更适合看长期变化。

## 相关

- [在 Duaer 里查气候预估](https://doc.duaer.com/zh/getting-started/climate-projection.md)
- [在 Duaer 里查英国电网碳强度](https://doc.duaer.com/zh/getting-started/grid-carbon.md)