diff --git a/esphome/components/mhz19/mhz19.cpp b/esphome/components/mhz19/mhz19.cpp
index f110dc8dcc..b6b4031e16 100644
--- a/esphome/components/mhz19/mhz19.cpp
+++ b/esphome/components/mhz19/mhz19.cpp
@@ -3,8 +3,7 @@
 
 #include <cinttypes>
 
-namespace esphome {
-namespace mhz19 {
+namespace esphome::mhz19 {
 
 static const char *const TAG = "mhz19";
 static const uint8_t MHZ19_REQUEST_LENGTH = 8;
@@ -156,5 +155,4 @@ void MHZ19Component::dump_config() {
   ESP_LOGCONFIG(TAG, "  Detection range: %s", LOG_STR_ARG(detection_range_to_log_string(this->detection_range_)));
 }
 
-}  // namespace mhz19
-}  // namespace esphome
+}  // namespace esphome::mhz19
diff --git a/esphome/components/mhz19/mhz19.h b/esphome/components/mhz19/mhz19.h
index f7ceefd16d..a27f1c31eb 100644
--- a/esphome/components/mhz19/mhz19.h
+++ b/esphome/components/mhz19/mhz19.h
@@ -5,8 +5,7 @@
 #include "esphome/components/sensor/sensor.h"
 #include "esphome/components/uart/uart.h"
 
-namespace esphome {
-namespace mhz19 {
+namespace esphome::mhz19 {
 
 enum MHZ19ABCLogic {
   MHZ19_ABC_NONE = 0,
@@ -74,5 +73,4 @@ template<typename... Ts> class MHZ19DetectionRangeSetAction : public Action<Ts..
   void play(const Ts &...x) override { this->parent_->range_set(this->detection_range_.value(x...)); }
 };
 
-}  // namespace mhz19
-}  // namespace esphome
+}  // namespace esphome::mhz19